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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() 
  5. {
  6. 	int n;
  7. 	cin >> n;
  8.  
  9. 	int tmp = n;
  10. 	int res;
  11. 	int a = 0, b = 0;
  12. 	int i=0;
  13. 	while (true) {
  14. 		a = (n - i) / 5;
  15. 		tmp -= a * 5;
  16. 		if (tmp % 3 == 0) {
  17. 			b += tmp / 3;
  18. 			res = a + b;
  19. 			break;
  20. 		}
  21. 		else if (tmp % 3 != 0) {
  22. 			if (a == 0) {
  23. 				cout << -1;
  24. 				return 0;
  25. 			}
  26. 			tmp = n;
  27. 			i += 5;
  28. 			continue;
  29. 		}
  30. 	}
  31. 	cout << res;
  32.  
  33. 	return 0;
  34. }
  35.  
Success #stdin #stdout 0s 5304KB
comments (?)
stdin 
4991
stdout 
999
https://ideone.com/qDie0s
language:
C++ (gcc 8.3)
created:
15 days ago
visibility:
public

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