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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long long n;
  6.     cin>>n;
  7.     long long s=0;
  8.     for (int i=1; i<=n; i+= 2) {
  9.         s+= i;
  10.     }
  11.     cout <<s;
  12. 	return 0;
  13. }
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin 
5
stdout 
9
https://ideone.com/biA7bS
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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