#include<iostream>
#include<cstdio>
using namespace std;

int uc(int n)
{
	int c;
	c=n%10;
	return c;
}

int sum(int n)
{
	int i,c=1,s=0,d;
	for(i=1;i<=n;i++)
	{
		for(d=1;d<=i;d++)
		{
			c=c*i;
		}
		s=s+c;
		c=1;
	}
return s;
}




int main()
{
	int t,i;
	freopen("cifra.in","r",stdin);
	freopen("cifra.out","w",stdout);
	cin>>t;
	int n[t+1];
	
	for(i=1;i<=t;i++)
	{
		cin>>n[i];
	}
	for(i=1;i<=t;i++)
	{
		cout<<uc(sum(n[i]))<<endl;
	}	
		
	return 0;
}