#include<stdio.h>
#include<string.h>
#include<math.h>

int i,j,cifra[10][5],rez[101]={0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0},p,N,T,power;
char number[120],c;
int main()
{
FILE*in=fopen("cifra.in","r");
FILE*out=fopen("cifra.out","w");
for(i=1;i<=9;i++)
 for(j=0;j<=4;j++)
 {
  power=pow(i,j);
  cifra[i][j]=power%10;
 }



fscanf(in,"%d",&T);
for(i=1;i<=T;i++)
{
 fscanf(in,"%s",&number);
 N=(int(number[strlen(number)-2])-48)*10+int(number[strlen(number)-1])-48;
}
fprintf(out,"%d",rez[N]);

fcloseall();
return 0;
}