void abort() { };

                                                                       
                                                  
                                                                             
                                                                   
                                                  
                                                                             
                                                                              
                                                                             

                                                                                                                                                               
                        
void assume_abort_if_not(int cond) {
  if(!cond) {abort();}
}
/*@ 
    requires ((\old(cond) != 0)) && (cond != 0);
    ensures ((\old(cond) != 0)) && (1);
@*/
void __VERIFIER_assert(int cond) {
  if (!(cond)) {
      ERROR: {/*@ assert(0); */;abort();}
  }
  return;
}
int __VERIFIER_nondet_int();
int main() {
    int i,j,k;
    i = 1;
    j = 1;
    k = __VERIFIER_nondet_int();
    if (!(0 <= k && k <= 1)) return 0;
/*@
loop invariant (((((2 <= i) && (((long long) i + k) <= 2)) && (1 <= ((long long) i + k))) || (((0 <= k) && (k <= 1)) && (i == 1))));
@*/
    while (i < 1000000) {
 i = i + 1;
 j = j + k;
 k = k - 1;
 __VERIFIER_assert(1 <= i + k && i + k <= 2 && i >= 1);
    }
    return 0;
}