from math import gcd

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

ans = 0
if M < N:
    ans += 1
    M, N = N, M

while True:
    if N == 1:
        ans += M - 1
        break
    ans += M // N + 1
    M, N = N, M % N
    if N == 0:
        print(-1)
        exit()
print(ans)