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  1. #include <iostream>
  2. #include <cstdio>
  3. #include <cmath>
  4. using namespace std;
  5.  
  6. int main() {
  7. 	long long int n, cnt=0, i=0;
  8. 	scanf("%lld", &n);
  9. 	while(n>0) {
  10. 		cnt+=n+(n-1)*i;
  11. 		n--, i++;
  12. 	}
  13. 	printf("%lld", cnt);
  14. 	return 0;
  15. }
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https://ideone.com/Kkzz3Q
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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