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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin >> n;
  7. 	long long tong = 0;
  8. 	for (int i = 0; i <= n; i++)
  9. 	    tong += i;
  10. 	cout << tong;
  11. 	return 0;
  12. }
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/xmNwY7
language:
C++ (gcc 8.3)
created:
7 hours ago
visibility:
public

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