#include<iostream>
#include<cmath>
using namespace std;
int main()
{
  int  n;int T;
     cin>>T;
	 int t,sum;
  while(T--)
  {
	  sum=1;
	  scanf("%d",&n);
	  t=n%10;
	for(int i=1;i<=n;i++)
	{
		sum*=t;
		if(sum>10)
			sum%=10;
	}
  cout<<sum<<endl;
  }
  return 0;
}

#include<iostream>
#include<cmath>
using namespace std;
int main()
{
  int  n;int T;
     cin>>T;
	 int ls[21]={1,4,7,6,5,6,3,6,9,0,1,6,3,6,5,6,7,4,9,0};
	while(T--)
	{
		cin>>n;
		if(!(n%20))
			cout<<0<<endl;
		else
			cout<<ls[n%20-1]<<endl;
	}
	return 0;
}