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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6. 	unsigned long long int n, a, answer;
  7. 	cin >> n >> a;
  8. 	if (a > 1)
  9. 	{
  10. 		answer = n*a;
  11. 		for(unsigned long long int i = n-1; i > 0; --i)
  12. 			answer = (answer+i)*a;
  13. 	}
  14. 	else
  15. 		answer = n*(n+1)/2;
  16. 	cout << answer;
  17. 	return 0;
  18. }
Success #stdin #stdout 0s 4392KB
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https://ideone.com/7psHic
eo1210
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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