func main()
	var n: int :: cui@inputInt()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var c: int :: cui@inputInt()
	
	var ans: bool :: false
	if(a < b & a < c)
		do ans :: true
	elif(a > b & a > c)
		do ans :: true
	end if
	do cui@print((ans ?("Yes", "No")) ~ "\n")
end func