# -*- coding: utf-8 -*-

import math

M,N = map(int, input().split())
gcd_mn = math.gcd(M, N)
M //= gcd_mn
N //= gcd_mn

ans = 0
# MとNが共に1，もしくは片方が負数となった時点でループを抜ける
while True:
    if (M/N)<1:
        temp = M
        M = N
        N = temp
    else:
        M -= N
    ans += 1
    if (M==1 and N==1) or M<0 or N<0:
        break

if M==1 and N==1:
    print(ans)
else:
    print(-1)