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