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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.   long long sum = 0;
  6.   long long x;
  7.   cin>>x;
  8.   for (long long i = 1; i <= x; i++) {
  9.     sum = sum + i;
  10.   }
  11.   cout <<  sum;
  12. }
  13.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/NAyBq1
language:
C++ (gcc 8.3)
created:
18 days ago
visibility:
public

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