[백준 8393번] 합

https://www.acmicpc.net/problem/8393

8393번: 합

 

#include <iostream>
using namespace std;

int main()
{
    int n, cnt;
    cnt = 0;
    cin >> n;
    
    
    for(n; n>0; n--){
        cnt += n;
     }
    
    cout << cnt << endl;
    return 0;
}