Score : $100$ points
You went shopping to buy cakes and donuts with $X$ yen (the currency of Japan).
First, you bought one cake for $A$ yen at a cake shop. Then, you bought as many donuts as possible for $B$ yen each, at a donut shop.
How much do you have left after shopping?
Input is given from Standard Input in the following format:
$X$ $A$ $B$
Print the amount you have left after shopping.
1234 150 100
You have $1234 - 150 = 1084$ yen left after buying a cake. With this amount, you can buy $10$ donuts, after which you have $84$ yen left.
1000 108 108
579 123 456
7477 549 593