N, S, B = gets.split.map(&:to_i)
H = gets.split.map(&:to_i)

h = H[0]
s = S
(1 ... N).each do |i|
	if H[i] >= h
		if H[i] - h > B * s
			puts "No"
			exit
		end
		h = H[i]
		s = S
	else
		if (S - s) * B > h - H[i]
			h = H[i]
			s = S
		end
	end
end

puts "Yes"