#include <iostream>
#include <fstream>
#include <string.h>
#include <cstdlib>

using namespace std;

int main()
{
    ifstream in("cifra.in");
    ofstream out("cifra.out");
    int a[100],T,l,n1;
    char n[102];
    for(int i=0; i<100; i++)
    {
        a[i]=i;
        for(int j=2; j<=i; j++)
        {a[i]=(a[i]*i)%10;}
        a[i]=(a[i]+a[i-1])%10;
    }

    in>>T;
    for(int i=1; i<=T; i++)
    {
        in>>n;
        l=strlen(n);
        if(l>1)
        {
            char n2[2];
            n2[0]=n[l-2];
            n2[1]=n[l-1];
            n1=atoi(n2)-'0';
        }
        else {n1=n[l-1]-'0';}
        out<<a[n1]<<"\n";
    }
    in.close();
    out.close();

    return 0;
}