#!/usr/koeki/bin/ruby

number = ARGV[0].to_i

item = 0

1.upto(number) do |index|
  index = (-1)**index * index
  
  
  printf("%d",index)

  if index > 0
    print("")
  elsif (number == index || number == -1 * index)
    break
  else 
    print("+")
  end
  
  item += index
end

printf("=%d\n",item)