题目描述
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?
-----Constraints-----
- $1 \leq A, B \leq 1 000$
- $A + B \leq X \leq 10 000$
- X, A and B are integers.
-----Input-----
Input is given from Standard Input in the following format:
X
A
B
-----Output-----
Print the amount you have left after shopping.
-----Sample Input-----
1234
150
100
-----Sample Output-----
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.
输入格式
见题面
输出格式
见题面
样例输入
1234
150
100
样例输出
84