#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

ifstream f("cifra.in");
ofstream g("cifra.out");

int main()
{
    int t, n, s, i, j;
    char c;
    f>>t;
    for(i=1;i<=t;i++)
    {
        int k;
        f>>c;
        k=c-'0';
        s=0;
        for(j=1;j<=k;j++)
            s=s+pow(j, j);
        g<<s%10<<"\n";
    }
    return 0;
}