100870: [AtCoder]ABC087 A - Buying Sweets

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

Score : $100$ points

Problem Statement

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 1

1234
150
100

Sample Output 1

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.


Sample Input 2

1000
108
108

Sample Output 2

28

Sample Input 3

579
123
456

Sample Output 3

0

Sample Input 4

7477
549
593

Sample Output 4

405

Input

题意翻译

你手头有$X$ 元钱,每个蛋糕$A$ 元,每个甜甜圈$B$ 元,求购买蛋糕和甜甜圈后最少剩下多少钱。 **注意:如果钱可以花光,请输出$0$ 。样例3和样例7的输出都为0。** 你会先买一个蛋糕,然后尽可能的多买甜甜圈。 感谢@hiuseues 提供的翻译

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