hui 2.0

def f():
    s = input().split(' ')
    x = int(s[0])
    y = int(s[1])
    res = 0
    while y != x and res < 101:
        if abs(y - x - 3) >= abs(y - 4*x):
            if (x + 12 == x * 4) or x*4 == y:
                x*=4
            else:
                x+=3
        else:
            x+=3
        res+=1
        if res == 101:
            print(-1)
    if res < 101:
        print(res)