#include<stdio.h>
#include<stdlib.h>
#include<math.h>
unsigned int t; unsigned long n,i,s;
int main()
{
    FILE*f=fopen("cifra.in","r");
    FILE*g=fopen("cifra.out","w");
    fscanf(f,"%u",&t);
    while(t)
    {
        fscanf(f,"%lu",&n);
        if(n>14)
        {
            s=n%5;
            switch(s)
            {
                case 0: fprintf(g,"%d\n",4); break;
                case 1: fprintf(g,"%d\n",6); break;
                case 2: fprintf(g,"%d\n",8); break;
                case 3: fprintf(g,"%d\n",0); break;
                case 4: fprintf(g,"%d\n",2); break;
            }
        }
        else
        {

            for(i=1;i<=n;i++)
            {
                s+=(int)pow(i,i)%10;
            }
            s%=10;
            fprintf(g,"%lu\n",s);
            s=0;
        }
        t--;
    }
    fclose(f);
    fclose(g);
    return 0;
}