func main()
	var n: int :: cui@inputInt()
	var ans: bool :: false
	if(n = 1)
		do ans :: true
	else
		var factors: []int :: math@primeFactors(n)
		var dic: dict<int, bool> :: #dict<int, bool>
		for i(0, ^factors - 1)
			do dic.add(factors[i], true)
		end for
		do ans :: ^dic <= 2
	end if
	do cui@print((ans ?("Yes", "No")) ~ "\n")
end func