#include <iostream>
#include<fstream>
using namespace std;
int v[34],n;
    int main()
{
    ifstream in("cifra.in");
    ofstream out("cifra.out");
    int i,n,p;
    long long s,t;
    in>>n;
    s=0;
    for(i=1;i<=n;i++)
        in>>v[i];
    for(i=1;i<=n;i++)
    {
        s=0;
        for(i=1;i<=v[i];i++)
        {
            t=1;
            for(p=1;p<=i;p++)
            t=t*i;
        s=s+t;
        out<<s%10<<"\n";}
        in.close();
        out.close();
    }

}