X, Y, H = gets.split.map(&:to_i)

x = Rational(1000 * X, 1)
y = Rational(1000 * Y, 1)
h = H
cnt = 0

while h < x || h < y
  if x <= y && h < x
    x /= 2
    h *= 2
  elsif y < x && h < y
    y /= 2
    h *= 2
  elsif h < x
    x /= 2
    h *= 2
  elsif h < y
    y /= 2
    h *= 2
  end

  cnt += 1
end

puts cnt