import java.util.*;

public class MoreNames {
    private Map<String,String> m = new HashMap<String,String>();

    public void MoreNames() {
        m.put("Mickey", "Mouse");
        m.put("Mickey", "Mantle");
    }

    public int size() {
        return m.size();
    }

    public static void main(String args[]) {
        MoreNames moreNames = new MoreNames();
        System.out.println(moreNames.size());
    } 
}