A, B = gets.split.map(&:to_i)
T = 60 * 60 * 24

def f(t)
  t * Rational(360, 60 * 60)
end

def g(t)
  t * Rational(360, 60 * 60 * 12)
end

def t1(m, s)
  (m * 60 + s) % 3600
end

def t2(h, m, s)
  ((h * 60 * 60) + m * 60 + s) % (60 * 60 * 12)
end

min_diff = Float::INFINITY
ans = 0

0.upto(3600) do |i|
  a = t1(B, i)
  b = t2(A, B, i)
  diff = (f(a) - g(b)).abs

  if min_diff > diff
    ans = i
    min_diff = diff
  end
end

puts ans