#include<iostream>
#include<iomanip>
using namespace std;
float fact(int n)
{
      float f=1;
      for(int i=2;i<=n;i++)
      f*=i;
      return f;
}
int main()
{
    int N,num;
    while(cin>>N)
    {   
       num=fact(N);int s=0;
       while(s==0){
          s=num%10;
          num=num/10;
       
     }
  
   cout<<setw(5)<<N<<" -> "<<s<<endl;
    }system("pause");return 0;
}