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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4. 	int n, res,a1=2,d=2;
  5. 	cin >>n;
  6. 	res=((2*a1+d*(n-1))/2)*n;
  7. 	cout << (res+1);
  8. 	return 0;
  9. }
Success #stdin #stdout 0s 15232KB
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https://ideone.com/GoaBuq
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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