//{0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0};
#include <fstream>
#include<string.h>
#include<stdio.h>
#include<stdlib.h>
using namespace std;

ifstream fin ( "cifra.in");
ofstream fout ("cifra.out");
int v[101];
int main()
{
    int n,k,i,s=0,j,p,l,put,aux=0,x;
    char nr[200],e,r;
    fin>>n;
    for ( p=1;p<=100;p++)
    {
        j=p;
        s=0;
        for(i=1;i<=j;i++)
        {
            k=i%10;
            put=1;
            for(l=1;l<=i;l++)
            {
                put=put*k;
                put=put%10;

            }

            s=s+put;
            s=s%10;
        }
        v[p]=s;
    }
    fin.get();
    for(i=0;i<n;i++)
    {
        fin.get(nr,200);
        fin.get();
        x=strlen(nr);
        if (x==1)
            aux=atoi(nr);
        else
            aux=(atoi(&(nr[x-2])));
        /*
        e=*(nr+x-1);
        r=*(nr+x-2);
        aux=atoi(&e);//;+10*atoi(r);
        */
        fout<<v[aux]<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}