> #include<iostream>
> using namespace std;
> int main()
> {
> 	int i,n,s;
> 	while(cin>>n)
> 	{
> 		s=1;
> 		for(i=1;i<=n;i++)
> 		{
> 			s*=i;
> 			while(s%10==0)
> 				s/=10;
> 				s%=100000;
> 		}
> 			s%=10;
> 			printf("%5d -> %d\n",n,s);
> 	}
> 	return 1;
> }