Submission

Score: 100

User: 38408

Problemset: นักบินอวกาศ

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-06 11:57:39

#include <bits/stdc++.h>
using namespace std;
int main(){
    int t ;
    int star = 4;
    int plus = 10 ;
    cin >> t ;
    if(t==0){
        cout << "0" ;
        return 0;
    }
    for (int i = 1; i <= t; i++)
    {
        if(i>=2){
            star += plus ;
            plus+=6;
        }
        
    }
    cout<<star;
}