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CSES - HIIT Open 2017

HIIT Open 2017

Contest start:2017-05-27 11:00:00
Contest end:2017-05-27 16:00:00

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History
2017-05-27 11:02:36
Task:Algorithm
Sender:Nää jäbät
Submission time:2017-05-27 11:02:36
Status:READY
Result:ACCEPTED

Show test data

Code

#include <bits/stdc++.h>

#define ll long long

using namespace std;

int main () {
    ll n;
    ll ans = 0;
    cin>>n;
    for (ll i = 1; i <= n; i++) {
        ans += (i * (n - i + 1));
    }
    cout<<ans<<endl;
}