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

using namespace std;
ifstream fin ("cifra.in");
ofstream fout ("cifra.out");
string s;

int main()
{
    int n, cnt = 0, j = 1, num;
    fin >> n;
    for (int k = 0; k < n; ++k) {
    cnt = 0, j = 1;
    fin >> s;
    if (s.size() > 1)
        num = (s[s.size() - 2] - 48) * 10 + (s[s.size() - 1] - 48);
    else
        num = s[0] - 48;

        for (int i = 1; i <= num; ++i) {
            if (j == 1)
            ++cnt;

            if (j == 2) {
                if (i % 4 == 2)
                    cnt += 4;
                else
                    cnt += 6;
            }

            if (j == 3) {
                if (i % 4 == 3)
                    cnt += 7;
                else
                    cnt += 3;
            }

            if (j == 4)
                cnt += 6;
            if (j == 5)
                cnt += 5;
            if (j == 6)
                cnt += 6;

            if (j == 7) {
                if (i % 4 == 1)
                    cnt += 7;
                else
                    cnt += 3;
            }

            if (j == 8)
                cnt += 6;
            if (j == 9)
                cnt += 9;
            ++j;
            if (j == 10)
            j = 0;
        }
    fout << cnt % 10 << "\n";
    }
    return 0;
}