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
84
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
28
579 123 456
0
7477 549 593
405