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