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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 11:07:57
Task:Algorithm
Sender:Proudly div 2
Submission time:2017-05-27 11:07:57
Status:READY
Result:ACCEPTED

Show test data

Code

#include <iostream>

using namespace std;

typedef long long LL;

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