#include <fstream>
#include <string.h>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
long long   n , r , t, s ;
int z[101] , j, a , b , c ,lg , k , i  ;
char x[200];
int main()
{



        for(k=1;k<=99;k++)
        {
        s=0;
        for(j=1;j<=k;j++)
        {
            c=j%10;
            r=j%4;
            if(r==1)
                s=s+c;
            else
                if(r==2)
                    s=s+c*c;
                else
                if(r==3)
                    s=s+c*c*c;
                else
                    s=s+c*c*c*c;
            s=s%10;
            z[k]=s;
        }
        }
        fin>>t;
    for(i=1;i<=t;i++)
    {
        fin>>x;
        lg=strlen(x);
        if(lg==1)
            n=x[0]-'0';
        else
        {
            a=x[lg-2]-'0';
            b=x[lg-1]-'0';
            n=a*'0'+b;
        }
        fout<<z[n]<<endl;

    }

    return 0;
}