import math

m, n = [int(x) for x in input().split()]

res = 0
cnt = 0
for i in range(10 ** 9):
    d = math.gcd(m, n)
    m //= d
    n //= d
    if m == 1 and n == 1:
        res = cnt
        break
    elif m < 1 or n < 1:
        res = -1
        break
    if m < n:
        m, n = n, m
        cnt += 1
    elif n == 1:
        cnt += m - 1
        m = 1
    else:
        cnt += m // n
        m = m % n

print(res)