require 'prime'

x = gets.to_i
ans = 1

hash = Hash.new(0)
Prime.each(Math.sqrt(x)) do |prime|
  quo, rem = x.divmod(prime)
  if rem == 0 then
    hash[prime] += 1
    x = quo
    redo
  else
    ans *= prime if hash[prime] % 2 == 1
  end
end
ans *= x

puts ans