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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6.   long long x;
  7.   cin>>x;
  8.   long long sum = x * (x + 1) / 2;
  9.   cout << sum;
  10. }
  11.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
3
stdout 
6
https://ideone.com/oDdeLd
language:
C++ (gcc 8.3)
created:
17 days ago
visibility:
public

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