#include <iostream>
#include <fstream>
using namespace std;
string a;
char x;
int t,i,j,s;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>>t;
    for (i=1;i<=t;i++)
    {
        f>>a;
    }
    for (i=1;i<=t;i++)
    {
        x=a[0]-'0';
        for (j=1;(1<<j)<=x;j++)
        {
            s=s+(x*x);
        }
        g<<s%10<<"\n";
    }
    return 0;
}