#include<iostream>
using namespace std;

int compute_sum(int &n){//Sum from 1 to n
  int sum = 0;
  for(;n>0;--n)
    sum+=n;
  return sum; 
}

int main(){
  int n=3,sum;
  cout<< n<< endl; 
  sum=compute_sum(n);
  cout << n << endl;
  cout << sum << endl;
}