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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4. int n, i, pogl, a;
  5. cin >> n;
  6. i = 2;
  7. pogl = 0;
  8. if(n == 0){
  9. 	cout << 0;
  10. }
  11. if(n == 1){
  12. 	cout << 1;
  13. }
  14. if(n > 1){
  15. while(i != n + 1){
  16. 	a = 4 * (i - 1);
  17. 	pogl = pogl + a;
  18. 	i++;
  19. }
  20. cout << pogl + 1;
  21. }
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 4400KB
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https://ideone.com/IGt7Cq
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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