#include <fstream>
#include<cstring>
using namespace std;

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

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

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()
{
    for(int i=1;i<100;i++)
        U[i]=(U[i-1]+ucif(i))%10;
}

int main()
{
    int T, ncif, rest;
    char sir[100];
    precalcul();
    f>>T;
    while(T--)
    {
        f>>sir;
        ncif = strlen(sir);
        rest = sir[ncif-1] - '0';
        if(ncif >= 2)
            rest += (sir[ncif-2]-'0') * 10;
        g << U[rest] << '\n';
     }
     f.close();
     g.close();
    return 0;
}