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public interface IUsableItem
{
	public void Use(Player player);
}

public class HealthPotion : IUsableItem
{
    public void Use(Player player)
    {
		player.health += 50;
    }
}

public class SpeedPotion : IUsableItem
{
    public void Use(Player player)
    {
		player.speed += 10f;
    }
}

public class Player
{
	public int health { get; set; }
	public float speed { get; set; }

	public void OnLeftClick()
	{
		UseItem(new HealthPotion());
	}

	public void OnRightClick()
	{
		UseItem(new SpeedPotion());
	}

	public void UseItem(IUsableItem item)
	{
		item.Use(this);
	}
}