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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// your code goes here
  6.     long long n;cin>>n;
  7.    cout<<(n*(n+1))/2;
  8. 	return 0;
  9. }
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/tF8loz
language:
C++ (gcc 8.3)
created:
337 days ago
visibility:
public

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