Statement

Calculate the total number of occurrences of the digit $x$ ($0\le x\le9$) among all integers in the interval $1$ to $n$. For example, in the range of $1$ to $11$, that is, among $1,2,3,4,5,6,7,8,9,10,11$, the digit $1$ appears $4$ times.

Input

Two integers $n$ and $x$, where $1\le n\le 10^6$ and $0\le x \le 9$, are separated by a single space.

Output

$1$ integer, representing the number of occurrences of $x$.

Samples

11 1

4