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Description

Student A believes that their lucky number is the largest non-negative integer not exceeding $N$ that is divisible by $K$. Can you help them calculate their lucky number?

Input Format

Input consists of a single line with two integers $N$ and $K$ ($1 \le N, K \le 2 \times 10^9$).

Output Format

Output a single line with an integer representing the lucky number.

Sample

3 2

2