void abort() { };
                                                                                                                                                          
                                                                                 
/*@ 
    requires ((cond != 0)) && (cond != 0);
    ensures ((cond != 0)) && (1);
@*/
void __VERIFIER_assert(int cond) { if(!(cond)) { ERROR: {/*@ assert(0); */;abort();} } }

int main() {
unsigned int x = 0;
unsigned int y = 10000000;
unsigned int z=0;
/*@
loop invariant (((z % 2) == 0));
@*/
	while(x<y){	
		if(x>=5000000)
			z=z+2;
		x++;
	}
  __VERIFIER_assert(!(z%2));
  return 0;
}