from fractions import *
P, Q = map(int, input().split())
x = P / Q
X = Fraction(P, Q)

ok = 0.0
ng = x
for i in range(60):
    mid = (ok + ng) / 2
    if Fraction(mid).limit_denominator(Q - 1) < X:
        ok = mid
    else:
        ng = mid

L = Fraction(ok).limit_denominator(Q - 1)

ok = 1.0
ng = x
for i in range(60):
    mid = (ok + ng) / 2
    if Fraction(mid).limit_denominator(Q - 1) > X:
        ok = mid
    else:
        ng = mid

R = Fraction(ok).limit_denominator(Q - 1)

print(L.numerator + L.denominator + R.numerator + R.denominator)