Submission

Score: 100

User: punzacp555

Problemset: นักบินอวกาศ

Language: cpp

Time: 0.003 second

Submitted On: 2026-09-24 22:17:47

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

int main() {
    cin.tie(0)->sync_with_stdio(0);
    int n;
    cin >> n;

    int inc = 4, ans = 0;
    for(int i=0; i<n; i++) {
        ans += inc;
        inc += 6;
    }

    cout << ans;
    return 0;
}