/*
cifra infoarena
*/
#include<vector>
#include<string>
#include<string.h>
#include<algorithm>
#include<cstdio>
#include<fstream>
#include<iostream>
#include<ctime>
#include<set>
#include<map>
#include<cmath>

using namespace std;

#define LL long long
#define PII pair<int ,int>
#define PCI pair<char ,int>
#define VB vector <bool>
#define VI vector <int>
#define VC vector <char>
#define WI vector<VI>
#define WC vector<VC>
#define RS resize
#define X first
#define Y second

#define FORN(i,n) for(int i=0;i<n;++i)
#define FOR(i,a,b) for(int i=a;i<=b;++i)
#define FORD(i,a,b) for(int i=a;i>=b;--i)
#define REPEAT do
#define UNTIL(x) while((x))

#define IN_FILE "cifra.in"
#define OUT_FILE "cifra.out"
ifstream f(IN_FILE);
ofstream g(OUT_FILE);

//variables
int t;
vector<short int> x;
string a;
//other functions
void reading()
{
	f >> t;
	x.RS(100);
	FOR(i, 1, 99)
	{
		int u = i;
		FOR(j, 2, i)
		{
			u = u*i % 10;
		}
		x[i] = (u+x[i-1])%10;
	}
	FORN(i, t)
	{
		f >> a;
		int co = 0;
		int n = a.length();
		if (n > 1)
		{
			co = (a[n - 2] - '0') * 10 + a[n - 1]-'0';
		}
		else
		{
			co = a[n - 1] - '0';
		}
		g << x[co] << "\n";
	}
	f.close();
}
void solving()
{
}
void write_data()
{
}
int main()
{
	reading();
	solving();
	write_data();
}