Print java static variable from another class

I would like to print the static variable of another class but I cant for some reason. Here is the error when compiling:

System.out.println(Creature.MAX_Y);
                               ^
  symbol:   variable MAX_Y
  location: class Creature
1 error

Here is the code for the Creature class:

package naturalselection.creature;

import naturalselection.food.Food;
import naturalselection.vector.Vector;
import naturalselection.creature.Target;
import java.util.*;
public class Creature{
  public static short MAX_X = 150;
  public static short MAX_Y = 150;
}

and the main class:

import naturalselection.creature.Creature;
import naturalselection.food.Food;

class Main{
  public static void main(String[] args){
    Creature c1 = new Creature(1, 1);
    System.out.println(Creature.MAX_Y);
  }
}

Here is the directory structure (part of it):

main.java
naturalselection -
+-- creature
    +-- Creature.java

You need to declare static variable in that class from where you are trying to get variable.
public static String variableName = "Value";