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