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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int a[150],sum;
  4. int main(){
  5. 	ios::sync_with_stdio(false);
  6. 	cin.tie(0),cout.tie(0);
  7. 	int n;
  8. 	cin>>n;
  9. 	for(int i=0;i<n;i++){
  10. 		sum+=(n-i)*(i+1);
  11. 	}
  12. 	cout<<sum;
  13. 	return 0;
  14. }
Success #stdin #stdout 0.01s 5320KB
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stdin
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4
stdout
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20
https://ideone.com/d4cmg5
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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