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