#include<stdio.h>
long v[1001],s,e,r,i,n,j;
int main()
{
	freopen("cifra.in","r",stdin);
	freopen("cifra.out","w",stdout);
	scanf("%ld",&n);
	for (i=1;i<=n;i++)
		scanf("%ld",&v[i]);
	for (i=1;i<=n;i++)
	{
		r=v[i]/10;
		e=v[i]%10;
		if (r>0)
			s=1;
		else
			s=0;
		for (j=1;j<=r;j++)
			s=s*7;
		if (e==1) s=s+1;
		if (e==2) s=s+5;
		if (e==3) s=s+2;
		if (e==4) s=s+8;
		if (e==5) s=s+3;
		if (e==6) s=s+9;
		if (e==7) s=s+2;
		if (e==8) s=s+8;
		if (e==9) s=s+7;
		printf("%ld\n",s%10);
	}
}