#include <stdio.h>
#include <cmath>
#include <iostream>

using namespace std;

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