Test

You are taking a computer science test. It is known that the test has $a$ tasks, each of which is evaluated with one point.

You have answered $b$ tasks.

To pass the test, you need to give the correct answer to at least $c$ tasks.

What is the maximum number of mistakes you could have made in those $b$ tasks and still pass the test?

Input

The first line contains an integer $a$ ($1\le a\le 50$) — the number of tasks.

The second line contains an integer $b$ ($1\le b\le 50$) — the number of tasks you have answered.

The third line contains an integer $c$ ($1\le c\le b$) — the minimum number of tasks you need to answer correctly to pass the test.

It is guaranteed that the answer is always non-negative.

Output

Output a single integer — the answer to the problem.

Examples