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

int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    int t,i,j,s,k,aux;
    f>>t; char v[t];
    for(i=0;i<t;i++)
        f>>v[i];
    for(i=0;i<t;i++)
        {
            s=0;
            for(j=1;j<=v[i]-'0';j++)
            {
                aux=j;
                for(k=1;k<=j-1;k++)
                    aux=(aux*j)%10;
                s+=aux;
            }
              //s+=long(pow(j,j))%10;
            g<<s%10<<"\n";
        }
    return 0;
}