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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5. 	int n;	cin >> n;
  6. 	cout << ((n + 1) * n) / 2;
  7.  
  8. 	return 0;
  9. }
  10.  
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/q6ZtMu
language:
C++14 (clang 8.0)
created:
12 hours ago
visibility:
public

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