#include <iostream>
#include <fstream>

int main(){
  int a;
  std::ofstream out;
  out.open("pippo");

  out<<12<<std::endl;
  out.close();

  std::ifstream in;
  in.open("pippo");
  in >> a ;
  in.close();

  std::cout << "il tuo numero era " << a << std::endl;
}