#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;

int main()
{
    freopen ("cifra.in", "r", stdin);
    freopen ("cifra.out", "w", stdout);
    int t,n,s;
    scanf ("%d", &t);
    for (int i=1;i<=t;i++)
    {
        scanf ("%d", &n);
        s=0;
        for (int j=1;j<=n;j++)
            s+= pow(j,j);
        int a=s%10;
        printf ("%d",  a);
        printf ("\n");
    }
    return 0;
}