#include <iostream>
#include <fstream>
#include <cstdio>
using namespace std;
FILE *fin;
ofstream fout("cifra.out");
unsigned long long t,n,s,p,i,j,a,v[99999999];
int main()
{
    fin=fopen("cifra.in","r");
    fscanf(fin,"%llu",&t);
    for(i=1;i<=t;i++)
    {
        fscanf(fin,"%llu",&n);
        s=0;
        for(j=1;j<=n;j++)
        {
            p=1;
            for(a=1;a<=j;a++)
                p*=j;
            s+=p;
        }
        fout<<s%10<<"\n";
    }
    return 0;
}