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  1. #include<iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main ()
  6. {
  7.    long long N;
  8.    cin >> N;
  9.    cout << (N*(N+1)/2) <<".00\n";
  10.    return 0;
  11. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/CMdZrT
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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