#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{
    int n, nr, i, uc=0, t, j, v[101];
    char sir[1000];

    for(i=1;i<=100;i++)
    {
        t = 1;
        for(j=1;j<=i;j++)
            t = t*i%10;
        uc = (uc + t)%10;
        v[i] = uc;
    }
    sir[0] = '0';
    v[0] = 0;
    fin>>t;
    for(i=1;i<=t;i++)
    {
        fin>>sir+1;
        nr = (sir[strlen(sir)-2]-'0')*10+sir[strlen(sir)-1]-'0';
        fout<<v[nr]<<endl;
    }
    return 0;
}