#include<stdio.h>
long n;
int t;
FILE *g=fopen("cifra.out","w");

void solve (long a)
     {
     long s=0,i;
     int v[]={0,1,4,7,6,5,6,3,6,9};
     for (i=1;i<=a;++i)
	 s+=v[i%10];
     fprintf(g,"%ld\n",s%10);
     }

void citire ()
     {
     int i;
     long a;
     FILE *f;
     f=fopen("cifra.in","r");
     fscanf(f,"%d",&t);
     for (i=1;i<=t;++i)
	 {
	 fscanf(f,"%ld",&n);
	 a=n;
	 solve (a);
	 }
     fclose(f);
     }

int main ()
{
citire ();
fclose(g);
return 0;
}