#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("cifra.in");
ofstream fout("cifra.out");

int lgput(int a, int b)
{
    int p = 1;
    while(b > 0)
    {
        if(b % 2 == 1)
            p = (p *(a % 10)) % 10;
        a = (a * (a % 10)) % 10;
        b /= 2;
    }
    return p;
}
int vlast[101];


signed main()
{
    int t, i;

    fin >> t;
    fin.get();
    int lastm20;

    vlast[0] = 0;
    for(i = 1; i <= 100; i++)
        vlast[i] = (vlast[i - 1] + lgput(i, i)) % 10;
    for(i = 0; i < t; i++)
    {
        int rest = 0;
        char p, q, ch;

        p = q = '0';
        fin.get(ch);
        while(ch != '\n')
        {
            p = q;
            q = ch;
            fin.get(ch);
        }
        rest = ((p - '0') * 10 + q - '0') % 100;
        fout << vlast[rest] << '\n';
    }

    return 0;
}