Submission

Score: 0

User: 67

Problemset: คิดถึงแม่

Language: cpp

Time: 0.002 second

Submitted On: 2025-12-18 17:18:26

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

int main(){
    int n;
    long long sum = 0;
    cin >> n;
    for(int i = 1; i <= n; i++)
        sum += 6*i-2;
    cout << sum;
    return 0;
}