Problems
The amount of n-digit numbers
The amount of n-digit numbers
Two integers n and m are given.
Find the number of n-digit positive integers, which sum of the digits equals to m.
Input data
Two integers n and m (1 ≤ n ≤ 9, 1 ≤ m ≤ 81).
Output data
Print the amount of required numbers.
Examples
Input example #1
2 10
Output example #1
9