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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() 
  5. {
  6. 	int n;
  7. 	cin >> n;
  8. 	unsigned long long int counter = ((1 + n) * n) / 2;
  9. 	cout << counter;
  10. 	return 0;
  11. }
Success #stdin #stdout 0s 15224KB
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https://ideone.com/OY0CqV
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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