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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int T;
    cin >> T;
    vector<int> a = {2, 2, 5, 16, 65, 326, 1957, 13700};
    while(T--){
        ll N, ans = 0, c = 1;
        cin >> N;
        if(N < a.size()){
            cout << a[N] % 10 << '\n';
            continue;
        }
        for(int i = 0; c; i++){
            ans += c % 10;
            c *= (N - i) % 10;
        }
        ans %= 10;
        cout << ans << '\n';
    }
}