void abort() { };

                                                                       
                                                  
                                                                             
                                                                   
                                                  
                                                                             
                                                                              
                                                                             

                                                                                                                                                                
/*@ 
    requires ((cond != 0)) && (cond != 0);
    ensures ((cond != 0)) && (1);
@*/
void __VERIFIER_assert(int cond) {
  if (!(cond)) {
    ERROR: {/*@ assert(0); */;abort();}
  }
  return;
}
unsigned int __VERIFIER_nondet_uint();
/*@ 
    requires (1);
    ensures (0);
@*/
int main() {
  unsigned int sn=0;
  unsigned int loop1=__VERIFIER_nondet_uint(), n1=__VERIFIER_nondet_uint();
  unsigned int x=0;
/*@
loop invariant (((((long long) x * 2) == (((x / 2147483648) * 4294967296) + sn)) && (0 <= (x / 2147483648))));
@*/
  while(1) {
    sn = sn + (2);
    x++;
    __VERIFIER_assert(sn==x*(2) || sn == 0);
  }
}