fork download
copy 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6. 	long long n;
  7. 	cin>>n;
  8.  
  9. 	long long count5=0;
  10. 	for(long long i=5;i<=n;i+=5)
  11. 	{
  12. 		long long num=i;
  13. 		while(num%5 == 0)
  14. 		{
  15. 			num=num/5;
  16. 			count5++;
  17. 		}
  18. 		//cout<<"count2="<<count2<<" count5="<<count5<<endl;
  19. 	}
  20.  
  21. 	cout<<count5<<endl;
  22.  
  23. 	return 0;
  24. }
Success #stdin #stdout 0.85s 5280KB
comments (?)
stdin
copy 
1000000000
stdout
copy 
249999998
https://ideone.com/HoViFS
20
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!