#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
// typedef unsigned long long ull;
// const ll INF = numeric_limits<ll>::max() / 4;
// const int INF = numeric_limits<int>::max() / 4;
// cout << std::fixed << std::setprecision(15);


int main() {
	double eps = 1.0e-6;
	int T;
	cin >> T;
	for(int t = 0; t < T; t++){
		ll N;
		cin >> N;
		if(N == 0){
			cout << 2 << endl;
			continue;
		}
		if(N <= 10){
			double e = 1;
			double d = 1;
			for(ll i = 1; i <= N; i++){
				d *= (double)i;
				e += 1.0 / d;
			}
			e *= d;
			cout << (int)(e + eps) % 10 << endl;
			continue;
		}
		ll c = 1;
		ll x = N % 10;
		for(ll i = 1; i < 10; i++){
			c += x;
			x *= (N - i) % 10;
			x %= 10;
		}
		cout << c % 10 << endl;
	}
	return 0;
}