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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7. 	long long sum = 0;
  8. 	for(int i = 1;i <= n;i+=2){
  9. 		sum += 1ll*i;
  10. 	}
  11. 	cout << sum << endl;
  12. 	return 0;
  13. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/Tly4LG
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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