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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const int N = 1e5; 
  4.  
  5. int n;
  6.  
  7. int main() {
  8. 	ios::sync_with_stdio(0);
  9. 	cin.tie(0);cout.tie(0); 
  10.  
  11. 	cin >> n;
  12. 	int c5 = 0; 
  13. 	for (int i = 1; i <= n; i ++){
  14. 		int x = i;
  15.  
  16. 		while ( x % 5 == 0 ){
  17. 			 x /= 5; 
  18. 			 c5 ++; 
  19. 		}
  20. 	}
  21.  
  22. 	cout << c5; 
  23.  
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 5276KB
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https://ideone.com/bQDhhB
language:
C++14 (gcc 8.3)
created:
45 days ago
visibility:
public

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