#include <fstream>
#include <cmath>
using namespace std;
ifstream in ("cifra.in");
ofstream out ("cifra.out");

int main()
{
    int N,i,s=0,T,j;
    in>>T;
    for (j=1;j<=T;j++)
    {
    in>>N;
    for (i=1;i<=N;i++)
    {
        s=s+pow(i,i);
    }
    out<<s%10;
    s=0;
    }
    return 0;
}