#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int puteren(int n)
{
    int a=n,p=1;
    while(a>0){
        p=p*n;
        a--;
        }
    return p;
    }
int t,i,v[30001],j;
int main()
{
    fin>>t;
    for(i=1; i<=t; i++)
    {
        fin>>v[i];
        int s=0;
        for(j=1; j<=v[i]; j++)
            s=s+puteren(j);
        fout<<s%10<<"\n";
    }
    return 0;
}