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Problem C
Evening Out 2
Marika has two integers $A$ and $B$. She wants $A$ to be divisible by $B$. She can pay $1$ coin to increase or decrease $B$ by $1$. What is the minimum number of coins she must pay?
Input
The first and only line contains the integers $A$ and $B$ ($1 \le A, B \le 10^{15}$).
Output
Output a single line with the minimum number of coins Marika must pay.
Explanation of sample 1
In the first example, she can pay $2$ coins to increase $B$ from $5$ to $7$, which $A = 49$ is divisible with.
| Sample Input 1 | Sample Output 1 |
|---|---|
49 5 |
2 |
