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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     cin >> n;
  7.     int f = 1;
  8.     for (int i = 1; i <= n; i++){
  9.         f+= i;
  10.     }
  11.     cout << f << endl;
  12.     return 0;
  13. }
  14.  
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/4xVCXg
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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