// verifast_options{disable_overflow_check target:ILP32}


extern void __assert_fail (const char *__assertion, const char *__file,
      unsigned int __line, const char *__function)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
extern void __assert_perror_fail (int __errnum, const char *__file,
      unsigned int __line, const char *__function)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));
extern void __assert (const char *__assertion, const char *__file, int __line)
     __attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__noreturn__));

void reach_error(void) //@ requires false; 
//@ ensures true;
{((void) sizeof ((0) ? 1 : 0), __extension__ ({ if (0) ; else __assert_fail ("0", "benchmark20_conjunctive.c", 2, __extension__ __PRETTY_FUNCTION__); }));}
extern int __VERIFIER_nondet_int(void);//@ requires true; 
//@ ensures true;

extern _Bool __VERIFIER_nondet_bool(void);//@ requires true; 
//@ ensures true;

void __VERIFIER_assert(int cond) //@ requires (cond != 0); 
//@ ensures (cond != 0);
{
  if (!cond) {
    reach_error();
  }
}
int main() //@ requires module(benchmark20_conjunctive__verifast_instrumented_modified, true); 
//@ ensures junk();
{
  int i = __VERIFIER_nondet_int();
  int n = __VERIFIER_nondet_int();
  int sum = __VERIFIER_nondet_int();
  if (!(i==0 && n>=0 && n<=100 && sum==0)) return 0;
  while (i<n)//@ invariant ((0 <= i) && (0 <= sum));
 {
    sum = sum + i;
    i++;
  }
  __VERIFIER_assert(sum>=0);
  return 0;
}