def main():
	arrival_judgment()

def arrival_judgment():
	G, H = [input() for _ in range(2)]
	H = H.split()
	H_first_half = H[0: len(H) // 2]
	H_second_half = H[len(H) // 2: len(H)]
	half_half = H[len(H) // 2 - 3: len(H) // 2 + 3]
	G = G.split()
	N, S, B = (int(i) for i in G)
	remainder = S * B
	yes_no(H_first_half, H_second_half, half_half, remainder)

def checker(l, r):
	half = len(l) // 2
	remainder = r
	for i in range(half):
		first = int(l[i + 1]) - int(l[i])
		second = int(l[-1 + -i]) - int(l[-2 + -i])
		if first > remainder or second > remainder:
			print(first, second)
			return False
	return True

def yes_no(h_f, h_s, h_h, r):
	if checker(h_f, r) == True and checker(h_s, r) == True and checker(h_h, r) == True:
		print('Yes')
	else:
		print('No')

if __name__ == '__main__':
	main()