func isYes(n: int): bool
	for i(true $ int, n)
		if(i = true $ int)
			skip i
		end if
		if(n % i = false $ int)
			ret i = n
		end if
	end for
end func

func main()
	var n: int :: cui@inputInt()
	var ans: bool :: @isYes(n)
	do cui@print(ans ?("YES\n", "NO\n"))
end func