P=gets.chomp.to_i

def merusennu(p)
  # c = 0
  # num = 2 ** p - 1
  # while num > 0
  #   c += 1 if num % 2 == 1
  #   num = num >> 1
  # end
  return p + 1 -1
  # return c
end

puts merusennu(P)