#include<bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    freopen("cifra.in", "r", stdin);
    freopen("cifra.out", "w", stdout);
    long long n;
    cin >> n;
    long long sum = 0;
    int d, sume[n];
    for (int j = 0; j < n; j++){
        cin >> d;
        for (int i = 1; i <= d; i++){
            int termen = pow(i, i);
            termen %= 10;
            sum+=termen;
            sum %= 10;
        }
        sume[j] = sum;
        sum = 0;
    }
    for(auto i : sume) cout << i << endl;
return 0;
}