Closest Multiple

You are given two numbers $a$ and $b$ find the multiple of $b$ that is closest to $a$, if there are multiple answers print the smallest one. ###Input: - First and only line of input contains two integers $a$ and $b$. ###Output: Print a single line containing the expected output. ###Constraints - $1 \leq a \leq 1000$ - $1 \leq b \leq 1000$ ###Subtasks - 100 points original constraints. ###Sam