public class Pizza {
    private String pizzaSize; // mandatory
    private int cheeseCount; // optional
    private int pepperoniCount; // optional
    private int hamCount; // optional
    
    public Pizza(String pizzaSize) {
        this(pizzaSize, 0, 0, 0);
    }
    
    public Pizza(String pizzaSize, int cheeseCount) {
        this(pizzaSize, cheeseCount, 0, 0);
    }
    
    public Pizza(String pizzaSize, int cheeseCount, int pepperoniCount) {
        this(pizzaSize, cheeseCount, pepperoniCount, 0);
    }
    
    public Pizza(String pizzaSize, int cheeseCount, int pepperoniCount, int hamCount) {
        this.pizzaSize = pizzaSize;
        this.cheeseCount = cheeseCount;
        this.pepperoniCount = pepperoniCount;
        this.hamCount = hamCount;
    }
    
    // getters
}