Submission

Score: 100

User: idinkinjai

Problemset: นักบินอวกาศ

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-17 21:30:20

#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;cin>>n;

    vector<int> prefix(n+1);
    prefix[0]=4;
    for (int i=1;i<=n;i++){
        prefix[i] = prefix[i-1] + 6;
    }
    int ans=0;
    for (int i=0;i<n;i++){
        ans+=prefix[i];
    }
    cout <<ans;
    return 0;
}