#include <stdio.h>

int putere(int n)
{
	int p=1;
	for (int i=1; i <= n; i++)
			p *= (n%10);	 
	return p%10;
}
void adunare (int n)
{
	int s=0;
	for (int i = 1; i <= n; i++)
		s += putere(i);
	printf("%d\n",s % 10);
}

int main()
{
	int N=0, T=0;
	
	freopen("cifra.in", "r",stdin);
	freopen("cifra.out", "w",stdout);
	scanf ("%d", &T);
	for (int i=0; i < T; i++)
	{
		scanf("%d",&N);
		adunare(N);
	}
	fclose(stdin);
	printf("\n");
	fclose(stdout);
	return 0;
}