void abort() { };
                                                                       
                                                  
                                                                             
                                                                   
                                                  
                                                                             
                                                                              
                                                                             

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