#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

int x[102];

int cifra(int n)
{
        int p,j;
        p=1;
        for(j=1;j<=n;j++)
            p=(p*n)%10;
        return (x[n-1]+p)%10;
}
int main()
{
    int t,i,n,z;
    string N;
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    for(i=1;i<=100;i++)x[i]=0;
    x[1]=1;x[0]=0;
    for(i=2;i<=100;i++)
    {
        x[i]=cifra(i);
    }
    f>>t;
    for(i=1;i<=t;i++)
    {
        f>>N;
        z=N.length();
        if(z==1)n=N[z-1]-'0';
        else n=(N[z-2]-'0')*10+(N[z-1]-'0');
        g<<x[n]<<'\n';
    }
    return 0;
}