#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001



int main(){
	
	int t;
	cin>>t;
	rep(_,t){
		long long n;
		cin>>n;
		
		long long ans =0;
		long long cur = 1;
		rep(i,100){
			ans += cur;
			cur %= 10;
			long long t = n-i;
			if(t<0)break;
			cur *= t%10;
			cur %= 10;
			if(cur==0)break;
			
		}
		ans %= 10;
		cout<<ans<<endl;
	}
	
	
	return 0;
}