[백준] #8393 합

문제링크

#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, sum = 0;

    cin >> n;
    for (int i = 1; i < n + 1; i++)
    {
        sum += i;
    }

    cout << sum;
}