int lottery(void) {
    int numbers[5];
    read_numbers(numbers);

    if (numbers[0] == 31) {
      if (numbers[1] == 55) {
        if (numbers[2] == 13) {
          if (numbers[3] == 70) {
            if (numbers[4] == 3) {
              won();
            }
          }
        }
      }
    }
}