Java with input statements

I am doing Java with input statements that does math.  Ex: how many apples on hand? Input 200.  How many apples required on stock? 300. Then it returns a statement of 100 apples are needed on order.  I need a line in the code to return a 0 if the variable is a negative number .  Ex 500 apples on hand, 400 required in stock, 0 needed on order instead of -100 needed on order.  I’ve attached the code I have so far.  Everything works, no errors, but I don’t want it to return a negative number.

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