include Math
INF = 10 ** 12
def div_size(n)
  res = 0
  i = 1
  while i * i <= n
    if n % i == 0
      if n / i != i
        res += 2
      else
        res += 1
      end
    end
    i += 1
  end
  return res
end
X = gets.to_i

a = X / 2
b = (X + 1) / 2
pre = INF
ans = []

# binding.pry

while a > sqrt(X).floor && b <= X
  avalue = a - div_size(a)
  bvalue = b - div_size(b)
  dist = (avalue - bvalue).abs
  if pre > dist
    (ans = []) << [a, b] << [b, a]
    pre = dist
  elsif pre == dist
    ans << [a, b] << [b, a]
  end
  a -= 1
  b += 1
end
ans.uniq.sort_by!{|x, y|x}.each do |an|
  puts "#{an[0]} #{an[1]}"
end