#include <fstream>
///#include <cstring>

using namespace std;

int U[100]; ///U[i]=Uc(1^1+2^2+.....+i^i)

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

int ucif(int n)
{
    int uc=n%10,
        r=n%4,
        p=1;
    if(r==0)
        r=4;
    while(r--)
        p*=uc;
    return p%10;
}

void precalcul()
{
    //U[0]=0;
    for(int i=1; i<100; i++)
        U[i]=(U[i-1]+ucif(i))%10;
}
int main()
{
    int T, ncif, rest;
    char sir[101];
    precalcul();
    f >> T;
    f.ignore();
    while(T--)
    {
        f.getline(sir,101);
        ///ncif = strlen(sir);
        ncif=f.gcount()-1;
        rest = sir[ncif-1]-'0';
        if(ncif >= 2)
            rest += (sir[ncif - 2] - '0') * 10;
        g << U[rest] << '\n';
    }
    f.close();
    g.close();
    return 0;
}