#include <fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
unsigned long long   n , i , r , j , c , t, s ;
int main()
{
    fin>>t;

    for(i=1;i<=t;i++)
    {
        fin>>n;
        s=0;
        for(j=1;j<=n;j++)
        {
            c=j%10;
            r=j%4;
            if(r==1)
                s=s+c;
            else
                if(r==2)
                    s=s+c*c;
                else
                if(r==3)
                    s=s+c*c*c;
                else
                    s=s+c*c*c*c;
            s=s%10;
        }
        fout<<s<<endl;
    }
    return 0;
}