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 = c)
	elif(a < b)
		if(a < c)
			do ans :: true
		end if
	elif(a > b)
		if(a > c)
			do ans :: true
		end if
	end if
	do cui@print((ans ?("Yes", "No")) ~ "\n")
end func