require 'prime'
n=gets.to_i

n2=n
ps=[]
Prime.each(10**7) do |p1|
	if p1*p1<=n then
		while n2%p1==0
			ps<<p1
			n2=n2/p1
		end
	else
		break
	end
end
ps<<n2 if n2>1
if ps.size>2 then
	puts "YES"
else
	puts "NO"
end