#include<fstream>
#include<iostream>
using namespace std;
ifstream in ("cifra.in");
ofstream out ("cifra.out");
int main()
{
    int t,n,i,s,j,x,k;
    in>>t;
    for(i=1;i<=t;i++)
    {
        s=0;
        in>>n;
        for(j=1;j<=n;j++)
        {
            x=1;
            for(k=1;k<=j;k++)
                x*=j;
            s+=x;
        }
        printf("%i\n",s%10);
    }
    in.close();
    out.close();
    return 0;
}