#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f ("cifra.in");
ofstream g ("cifra.out");
unsigned t,e,i,j,x,v[11],w[101];
char sir[1000000000];
void cifr ()
{
    unsigned i,j;
    for (i=1;i<10;i++)
    {
        x=1;
        for (j=1;j<=i;j++) x=x*i;
        v[i]=(x)%10;
    }
}

void cif (unsigned x)
{
    unsigned i,q=0;
    for (i=1;i<=99;i++)
    {
        q=(q+v[i%10])%10;
        w[i]=q;
        //cout<<w[i]<<' ';
    }

}
void prec ()
{
    int e,i,cif1;
    for (e=1;e<100;e++)
    {
        cif1=1;
        for (i=1;i<=e;i++)
            cif1=cif1*e%10;
        w[e]=(w[e-1]+cif1)%10;
    }
}
int main()
{
    f>>t;
    prec();
    for (e=1;e<=t;e++)
    {
        f>>sir;
        if (strlen(sir)>1)
            x=(sir[strlen(sir)-2]-48)*10+sir[strlen(sir)-1]-48;
        else x=sir[strlen(sir)-1]-48;
        g<<w[x]<<'\n';
    }
    return 0;
}