N=gets.chomp.to_i

def match(n)
  # 6 => 9
  # 5 => 5
  # 4 => 4
  # 3 => 7
  # 2 => 1
  # 1 か 7しかない
  seven = n % 2 == 1
  c = (n.to_f / 2).to_i
  ret = ""
  for num in 0..c-1
    if num == (c-1) and seven
      ret = "7" + ret
    else
      ret = "1" + ret
    end
  end
  return ret
end

puts match(N)