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