#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]);
       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);
   }
}