a, b = gets.split.map(&:to_i)
a %= 12

a = a / 12.0 * 360.0 + b / 60.0 * 30
b = b / 60.0 * 360.0

if a < b then
    a += 360
end

puts ((a - b) / (5.5 / 60) + 1e-10).floor