#include <stdio.h>
int n[100],i,s,s1,j,t,l;
int main()
{
 freopen("cifra.in","r",stdin);
 freopen("cifre.out","w",stdout);
 scanf("%d",&t);
 for(i=1;i<=t;i++)
  scanf("%d",&n[i]);
for(i=1;i<=t;i++)
{ 
 s=0;
 for(j=1;j<=n[i];j++)
  {
       s1=1;
       for(l=1;l<=j;l++)
        s1=s1*(n[j]%10);
       s=s+s1;
  } 
 printf("%d",s%10); 
}                
 return 0;
}