void abort() { };
                                                                       
                                                  
                                                                             
                                                                   
                                                  
                                                                             
                                                                              
                                                                             

                                                                                                                                                                             
extern int __VERIFIER_nondet_int();
extern _Bool __VERIFIER_nondet_bool();
/*@ 
    requires ((1 <= \old(cond))) && (cond != 0);
    ensures ((1 <= \old(cond))) && (1);
@*/
void __VERIFIER_assert(int cond) {
  if (!cond) {
    /*@ assert(0); */;
  }
}
int main() {
  int x = __VERIFIER_nondet_int();
  int n = __VERIFIER_nondet_int();
  if (!(x==0 && n>0)) return 0;
/*@
loop invariant ((x < ((long long) n + 1)));
@*/
  while (x<n) {
    x++;
  }
  __VERIFIER_assert(x==n);
  return 0;
}