#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{
    int t,n,s;
        fin>>t;
            for (int i=1; i<=t;i++){
                fin>>n;
                   for (int j=1;j<=n;j++) {
                        s=j*j+s;

                    }
                    fout<<s%10;
                }


    return 0;
}