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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7. 	int sum=0;
  8. 	for(int r=0;r<=n;r++) {
  9. 		sum+=r;
  10. 	}
  11. 	cout << sum;
  12. }
Success #stdin #stdout 0s 4956KB
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https://ideone.com/2kiaMv
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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