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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=3; i<=n; i+=3) {
  9.         s+= i;
  10.     }
  11.     cout <<s;
  12. 	return 0;
  13. }
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin 
10
stdout 
18
https://ideone.com/an3mVj
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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