java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/SifaC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/float-newlib/float_req_bl_0730a.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f3d0b09 [2019-08-08 11:43:02,103 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-08 11:43:02,105 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-08 11:43:02,116 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-08 11:43:02,117 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-08 11:43:02,118 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-08 11:43:02,119 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-08 11:43:02,121 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-08 11:43:02,123 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-08 11:43:02,124 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-08 11:43:02,125 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-08 11:43:02,126 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-08 11:43:02,126 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-08 11:43:02,127 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-08 11:43:02,128 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-08 11:43:02,129 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-08 11:43:02,130 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-08 11:43:02,131 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-08 11:43:02,132 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-08 11:43:02,134 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-08 11:43:02,136 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-08 11:43:02,137 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-08 11:43:02,138 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-08 11:43:02,139 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-08 11:43:02,141 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-08 11:43:02,144 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-08 11:43:02,145 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-08 11:43:02,146 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-08 11:43:02,146 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-08 11:43:02,147 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-08 11:43:02,148 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-08 11:43:02,148 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-08 11:43:02,148 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-08 11:43:02,149 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-08 11:43:02,150 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-08 11:43:02,150 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-08 11:43:02,151 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-08-08 11:43:02,166 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-08 11:43:02,166 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-08 11:43:02,167 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-08 11:43:02,168 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-08 11:43:02,168 INFO L138 SettingsManager]: * Use SBE=true [2019-08-08 11:43:02,168 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-08 11:43:02,168 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-08 11:43:02,168 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-08 11:43:02,169 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-08 11:43:02,169 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-08 11:43:02,169 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-08 11:43:02,169 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-08 11:43:02,169 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-08 11:43:02,170 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-08 11:43:02,170 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-08 11:43:02,170 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-08 11:43:02,170 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-08 11:43:02,170 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-08 11:43:02,171 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-08 11:43:02,171 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-08 11:43:02,171 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-08 11:43:02,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 11:43:02,172 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-08 11:43:02,172 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-08 11:43:02,172 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-08 11:43:02,172 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-08 11:43:02,172 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-08 11:43:02,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-08 11:43:02,173 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-08 11:43:02,200 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-08 11:43:02,213 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-08 11:43:02,216 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-08 11:43:02,218 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-08 11:43:02,221 INFO L275 PluginConnector]: CDTParser initialized [2019-08-08 11:43:02,221 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/float-newlib/float_req_bl_0730a.c [2019-08-08 11:43:02,286 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04ef7e7c5/2ee6de076a1941ee99b1ff49a9c5b2ab/FLAG509aa6e08 [2019-08-08 11:43:02,763 INFO L306 CDTParser]: Found 1 translation units. [2019-08-08 11:43:02,764 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/float-newlib/float_req_bl_0730a.c [2019-08-08 11:43:02,771 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04ef7e7c5/2ee6de076a1941ee99b1ff49a9c5b2ab/FLAG509aa6e08 [2019-08-08 11:43:03,167 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04ef7e7c5/2ee6de076a1941ee99b1ff49a9c5b2ab [2019-08-08 11:43:03,176 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-08 11:43:03,178 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-08 11:43:03,178 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-08 11:43:03,179 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-08 11:43:03,182 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-08 11:43:03,183 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,186 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@502457fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03, skipping insertion in model container [2019-08-08 11:43:03,186 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,195 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-08 11:43:03,215 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-08 11:43:03,488 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:43:03,499 INFO L188 MainTranslator]: Completed pre-run [2019-08-08 11:43:03,641 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-08 11:43:03,670 INFO L192 MainTranslator]: Completed translation [2019-08-08 11:43:03,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03 WrapperNode [2019-08-08 11:43:03,671 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-08 11:43:03,671 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-08 11:43:03,671 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-08 11:43:03,671 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-08 11:43:03,682 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,682 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,692 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,693 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,704 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,714 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,718 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03" (1/1) ... [2019-08-08 11:43:03,721 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-08 11:43:03,722 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-08 11:43:03,722 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-08 11:43:03,722 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-08 11:43:03,723 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.08 11:43:03" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-08 11:43:03,787 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-08 11:43:03,787 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-08 11:43:03,788 INFO L138 BoogieDeclarations]: Found implementation of procedure __ieee754_sqrtf [2019-08-08 11:43:03,788 INFO L138 BoogieDeclarations]: Found implementation of procedure isinf_float [2019-08-08 11:43:03,788 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-08 11:43:03,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-08 11:43:03,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_float [2019-08-08 11:43:03,788 INFO L130 BoogieDeclarations]: Found specification of procedure __ieee754_sqrtf [2019-08-08 11:43:03,789 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-08-08 11:43:03,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2019-08-08 11:43:03,789 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-08-08 11:43:03,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-08-08 11:43:03,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-08-08 11:43:03,789 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2019-08-08 11:43:03,789 INFO L130 BoogieDeclarations]: Found specification of procedure isinf_float [2019-08-08 11:43:03,790 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-08 11:43:03,790 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-08 11:43:03,790 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-08 11:43:04,381 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-08 11:43:04,382 INFO L283 CfgBuilder]: Removed 8 assume(true) statements. [2019-08-08 11:43:04,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:43:04 BoogieIcfgContainer [2019-08-08 11:43:04,384 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-08 11:43:04,384 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-08 11:43:04,385 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-08 11:43:04,385 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-08 11:43:04,386 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.08 11:43:04" (1/1) ... [2019-08-08 11:43:04,399 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-08 11:43:04,401 INFO L155 IcfgInterpreter]: Building call graph [2019-08-08 11:43:04,409 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-08 11:43:04,417 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-08 11:43:04,419 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-08 11:43:04,471 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 28 [2019-08-08 11:43:04,532 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-08 11:43:04,532 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-08 11:43:04,534 INFO L179 IcfgInterpreter]: Location mainErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 155#false [2019-08-08 11:43:04,535 INFO L84 terpretationObserver]: All locations of interest are guaranteed to be unreachable. [2019-08-08 11:43:04,536 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-08 11:43:04,539 INFO L168 Benchmark]: Toolchain (without parser) took 1360.20 ms. Allocated memory was 139.5 MB in the beginning and 199.2 MB in the end (delta: 59.8 MB). Free memory was 87.7 MB in the beginning and 145.5 MB in the end (delta: -57.8 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. [2019-08-08 11:43:04,542 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 139.5 MB. Free memory was 105.6 MB in the beginning and 105.4 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-08-08 11:43:04,543 INFO L168 Benchmark]: CACSL2BoogieTranslator took 492.44 ms. Allocated memory was 139.5 MB in the beginning and 199.2 MB in the end (delta: 59.8 MB). Free memory was 87.5 MB in the beginning and 175.5 MB in the end (delta: -88.0 MB). Peak memory consumption was 21.3 MB. Max. memory is 7.1 GB. [2019-08-08 11:43:04,543 INFO L168 Benchmark]: Boogie Preprocessor took 50.32 ms. Allocated memory is still 199.2 MB. Free memory was 175.5 MB in the beginning and 173.7 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. [2019-08-08 11:43:04,544 INFO L168 Benchmark]: RCFGBuilder took 662.03 ms. Allocated memory is still 199.2 MB. Free memory was 173.7 MB in the beginning and 152.8 MB in the end (delta: 20.9 MB). Peak memory consumption was 20.9 MB. Max. memory is 7.1 GB. [2019-08-08 11:43:04,545 INFO L168 Benchmark]: Symbolic Interpretation took 151.95 ms. Allocated memory is still 199.2 MB. Free memory was 152.8 MB in the beginning and 145.5 MB in the end (delta: 7.3 MB). Peak memory consumption was 7.3 MB. Max. memory is 7.1 GB. [2019-08-08 11:43:04,549 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - AllSpecificationsHoldResult: All specifications hold All locations of interest are guaranteed to be unreachable. * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 139.5 MB. Free memory was 105.6 MB in the beginning and 105.4 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 492.44 ms. Allocated memory was 139.5 MB in the beginning and 199.2 MB in the end (delta: 59.8 MB). Free memory was 87.5 MB in the beginning and 175.5 MB in the end (delta: -88.0 MB). Peak memory consumption was 21.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 50.32 ms. Allocated memory is still 199.2 MB. Free memory was 175.5 MB in the beginning and 173.7 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 662.03 ms. Allocated memory is still 199.2 MB. Free memory was 173.7 MB in the beginning and 152.8 MB in the end (delta: 20.9 MB). Peak memory consumption was 20.9 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 151.95 ms. Allocated memory is still 199.2 MB. Free memory was 152.8 MB in the beginning and 145.5 MB in the end (delta: 7.3 MB). Peak memory consumption was 7.3 MB. Max. memory is 7.1 GB. RESULT: Ultimate proved your program to be correct! Received shutdown request...