#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);
        n%=10;
        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;
}