Uva 10079 - Pizza Cutting

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/*
    Uva 10079 - Pizza Cutting
    Verdict : Accepted
    Time : 0.000

    ==> Summation n numbers formula. And then add 1.
*/

#include <bits/stdc++.h>
using namespace std;

int main()
{
    long long n;

    while (1==(scanf("%lld",&n)))
    {
        long long s;

        if (n<0) break;

        s = (n*(n+1))/2;

        cout << s+1 << endl;
    }

    return 0;
}

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