int main() {
  long long int n = 21;
  long long int m = 1007;
  long long int hasil = 1;

  for (long long int i = 1; i <= n; i++) {
    hasil = (hasil * i) % m;
  }

  printf("Sesudah modulo: %I64d\n", hasil); // Sesudah modulo: 494
}