#include <bits/stdc++.h>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
string nr;
int v[25]={0, 1, 4, 7, 6, 5, 6, 3, 6, 9, 0, 1, 6, 3, 6, 5, 6, 7, 4, 9};
int sum[105];
int main()
{
    sum[0]=v[0];
    for (int i=1; i<=100; i++)
    {
        sum[i]=sum[i-1]+v[i%20];
        sum[i]%=10;
    }
    int test;
    fin >> test;
    while(test)
    {
        fin >> nr;
        int n;
        if (nr.size()>=2)
             n = (nr[nr.size()-2] - '0')*10 + (nr[nr.size()-1] - '0');
        else
            n = nr[nr.size()-1] - '0';
        n=n%100;
        fout << sum[n] << endl;
        test -- ;
    }
    return 0;
}