#include <iostream>

using namespace std;

int main()
{
    int n;
    int c = 0;
    cin >> n;
    if (n>0)
    {
        for (int i = 1; i <= n; i++)
            c += i;
        cout << c;
    }
    else if (n <= 0)
    {
        for (int i = n; i <= 1; i++)
            c += i;
        cout << c;
    }
    return 0;
}

Now do it in 0.001

Mmm... What?)


Edited by author 20.06.2018 16:02