Two little greedy bears have found two pieces of cheese in the forest of weight *a* and *b* grams, correspondingly. The bears are so greedy that they are ready to fight for the larger piece. That's where the fox comes in and starts the dialog: "Little bears, wait a little, I want to make your pieces equal" "Come off it fox, how are you going to do that?", the curious bears asked. "It's easy", said the fox. "If the mass of a certain piece is divisible by two, then I can eat exactly a half of the piece. If the mass of a certain piece is divisible by three, then I can eat exactly two-thirds, and if the mass is divisible by five, then I can eat four-fifths. I'll eat a little here and there and make the pieces equal". 

The little bears realize that the fox's proposal contains a catch. But at the same time they realize that they can not make the two pieces equal themselves. So they agreed to her proposal, but on one condition: the fox should make the pieces equal as quickly as possible. Find the minimum number of operations the fox needs to make pieces equal.
The first line contains two space-separated integers *a* and *b* (1 ≤ *a*, *b* ≤ 10<sup class="upper-index">9</sup>).

import math

a, b = [int(ab) for ab in input().split()]
gdc = math.gcd(a, b)

a = (a/gdc)
b = (b/gdc)

res = 0

while a > 1:
    if a % 2 == 0:
        a=a/2
        res += 1
    if a % 3 == 0:
        a=a/3
        res += 1
    if a % 5 == 0:
        a = a / 5
        res += 1
    if a != 1 and a%2 != 0 and a%5 != 0:
        print("-1")
        exit(0)

while b > 1:
    if b % 2 == 0:
        b=b/2
        res += 1
    if b % 3 == 0:
        b=b/3
        res += 1
    if b % 5 == 0:
        b = b / 5
        res += 1
    if b != 1 and b%2 != 0 and b%5!= 0:
        print("-1")
        exit(0)
print(f"{res}")

	 		 		 	 	 	 			 		 		 				 	