text: #include <iostream>
  #include "prob_1.h"
  
  int main(int, char**) {
      std::cout << prob_1::get_precalculated() << std::endl;
      std::cout << prob_1::get_by_loop() << std::endl;
      std::cout << prob_1::get_by_ranges() << std::endl;
  }
  