extern int __VERIFIER_nondet_int();
void abort() { };
                                                                                                                                                          
                                                                            

/*@ 
    requires (1);
    ensures (((((((((3 == \result) && (x == 3)) || ((2 == \result) && (x == 2))) || ((5 == \result) && (5 == x))) || ((\result == 1) && (x == 1))) || ((x == 4) && (4 == \result))) || ((\result == 0) && (x == 0))) || (5 < x)));
@*/
int id(int x) {
  if (x==0) return 0;
  return id(x-1) + 1;
}

int main() {
  int input = 5;
  int result = id(input);
  if (result != 5) {
    ERROR: {/*@ assert(0); */;abort();}
  }
}