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.

Examples

Input

1234
150
100

Output

84

Input

1000
108
108

Output

28

Input

579
123
456

Output

0

Input

7477
549
593

Output

405

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