#include <iostream>
#include <stdio.h>
using namespace std;
FILE *f,*g;
int main()
{
    int n,t,i,a,s,b;
    f=fopen("cifra.in","r");
    g=fopen("cifra.out","w");
    fscanf(f,"%d",&t);
    s=0;
    for(i=1;i<=t;i++)
    {
        fscanf(f,"%d",&n);
        b=1;
        for(a=1;a<=n;a++)
        {
            b=b*n%10;
        }
        s=s+b%10;
        s=s%10;
        fprintf(g,"%d\n",s);
    }
    fclose(f);
    fclose(g);
    return 0;
}