#include <iostream>
#include <stack>

using namespace std;

int main()
{
    stack<int> first;
    int toplam,i,limit;
    toplam=0;

    cout<<"max sayi:";
    cin>>limit;

    for(int i=0;i<=limit;i++)
    {
        first.push(i);
    }
    while(!first.empty())
    {

        int z = (int) first.top();
        toplam = toplam+z;
        first.pop();
    }


    cout << "toplam :"<<toplam << endl;
    return 0;
}