#include <iostream>
#include <fstream>

using namespace std;

int main()
{   int n,t,i,j,s,c;
    ifstream f("cmmdc.in");
    ofstream g("cmmdc.out");
    f>>t;
    for(j=1;j<=t;j++)
    {
        f>>n;
        for(i=1;i<=n;i++)
        {
            s=0;c=0;
            s=s+(i^2);
            c=s%10;

        }
    }
    g<<c;
    f.close();
    g.close();


    return 0;
}