You are given 2 integers a, b. Find the number of i for which i! is divisible by a but not b. if i! is divisible by a and b, then you should not count that i.

Input

One line that contains a and b.

Output

Output the result in one line.

Example

Input:
2 3

Output:
1

Constraints

1 ≤ a ≤ b ≤ 10⁷

Explanation

2! is the only factorial which is divisible by 2 and not divisible by 3.