#include <iostream>
#include<fstream>
using namespace std;
int main()
{
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    int t,n,i,j,s,p;
    f>>t;
    while(t!=0)
    {
        f>>n; s=0;
        for(i=1;i<=n;i++)
        {
            p=1;
            for(j=1;j<=i;j++)
                p=p*i;
            s=s+p;
        }
        g<<s%10<<endl;
        t--;
    }

g.close();
    f.close();
    return 0;
}