import fractions

def solver():
    gcd = fractions.gcd(M, N)
    s = [M//gcd, N//gcd]
    depth = 0
    while 1:
        if s[0] == s[1]: # 1
            break
        if s[0] > s[1]:
            if s[1] == 1:
                depth += s[0] - 1
                break
            else:
                depth += 1
                s = [s[0]-s[1], s[1]]
        else:
            depth += 1
            s = [s[1], s[0]]
            if s[1] == 1:
                depth += s[0] - 1
                break
    return depth

M, N = map(int, input().split(" "))
if M == 0:
    print(-1)
else:
    print(solver())