#include<bits/stdc++.h>
using namespace std;

int ans =0,num =1;
long long n;

int main()
{
	cin>>n;
	for(int i =1;i<=n;++i)
	{
		num *= n;
		while(!num%10)
		{
			num /= 10;
		}
		num %=1000000;
	}
	ans = num%10;
	cout<<ans<<endl;
	return 0;
}