Problems
Zeros in the product
Zeros in the product
Let P(a, b) be the product of all integers from a to b inclusively.
Given a and b, find the number of consecutive zeros at the end of the decimal notation of the number P(a, b).
Input data
Two integers a and b\:(-10^9 ≤ a ≤ b ≤ 10^9).
Output data
Print one number — the required number of zeros.
Examples
Input example #1
1 6
Output example #1
1