func main()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var c: int :: cui@inputInt()
	var d: int :: cui@inputInt()
	var s: int :: cui@inputInt()
	
	var ans: bool :: a * c + b * d <= s
	do cui@print((ans ?("Yes", "No")) ~ "\n")
end func