Zeros in the product#3734

Zeros in the product

1 second

128 megabytes

Medium

Let $P (a, b)$ 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 $P (a, b)$ P(a, b).

Input

In a single line two integers $a$ and $b (- 1 0^{9} \leq a \leq b \leq 1 0^{9})$ b\:(-10^9 \leq a \leq b \leq 10^9).

Print one number — the required number of zeros.

Example 1

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P (a, b)

P (a, b)

b (- 1 0^{9} \leq a \leq b \leq 1 0^{9})