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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long long n;
  6. 	cin >> n;
  7. 	n%2==0;
  8.     cout<<n*(n+1)/2<<endl;
  9. 	return 0;
  10. }
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin 
6
stdout 
21
https://ideone.com/eAOuGA
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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