from fractions import Fraction
p, q = map(int, input().split())
r = Fraction(p, q)

fmn = Fraction(1)
y = 1
while y <= q:
    x = y * p // q + 1
    f = Fraction(x, y)
    if f < fmn:
        fmn = f
    y = (q * x + p - 1) // p

fmx = 0
y = 1
while y <= q:
    x = (y * p - 1) // q
    f = Fraction(x, y)
    if f > fmx:
        fmx = f
    y = q * (x + 1) // p + 1

ans = fmn.numerator + fmn.denominator + fmx.numerator + fmx.denominator
print(ans)