a, b = gets.split.map &:to_f
h = a / 12
m = b / 60
if h > m
    p ((h - m) / (1.0 / 3600 - 1.0 / 43200)).floor
else
    p ((h - m + 1) / (1.0 / 3600 - 1.0 / 43200)).floor
end