#include <stdio.h>

int ucf[]={0,1,4,7,6,5,6,3,6,9};

int main()
{
	freopen("cifra.in","r",stdin);
	freopen("cifra.out","w",stdout);
	int n,sum,i,a,b,j,t,k;
	scanf("%d",&t);
	for(k=1;k<=t;k++)
	{
		sum=0;
		scanf("%d",&n);
		a=0;
		for(i=1;i<=n;i++)
		{
			b=1;
			for(j=1;j<=i;j++)
				b=(b*i)%10;
			a=(a+b)%10;
		}
		printf("%d\n",a);
	}
	return 0;
}