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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4.  
  5. int main() {
  6. 	int n, res = 2;
  7. 	cin >> n;
  8.  
  9. 	if (n == 0) {
  10. 		cout << 0;
  11. 	} else {
  12. 		for (int i = 2; i <= n; i++) {
  13. 			res += i;
  14. 		}
  15.  
  16. 		cout << res;
  17. 	}
  18.  
  19.  	return 0;
  20. }
Success #stdin #stdout 0s 5312KB
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https://ideone.com/JMGEm6
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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