Submission

Score: 100

User: kinzap

Problemset: นักบินอวกาศ

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-12 16:53:45

#include <iostream>
using namespace std;

long long n,s,pls,sum=4,summ=4;

int main(){
    cin >> n;
    
    if(n==0)cout << 0;
    else if(n==1)cout <<4;
    else{
        for(int i = 1;i<n;i++){
            sum = sum+6;
            //cout << "sum " << sum <<endl;
            summ+=sum;
        }
        
        cout <<summ;
    }
}