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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n,j=0,sum=0;
  6. 	cin >> n;
  7. 	for(int i=0 ; i<n ; i++){
  8. 		j=j+2;
  9. 		sum=sum+j;
  10. 	}
  11. 	cout << (sum+1) << endl;
  12. 	return 0;
  13. }
Success #stdin #stdout 0s 3416KB
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https://ideone.com/zSWrxB
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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