Submission

Score: 100

User: new2

Problemset: นักบินอวกาศ

Language: cpp

Time: 0.003 second

Submitted On: 2025-12-18 18:28:01

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

int main(){
    int t;
    cin >> t;
    int h = 4;
    int ans = 0;
    if (t == 0){
        cout << "0";
        return 0;
    }
    for (int i = 1; i < t; i++) {
        ans += h;
        h += 6;
    }
    cout << ans+h;
}