#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);
 }
}