def main():
	arrival_judgment()

def arrival_judgment():
	G, H = [input() for _ in range(2)]
	H = H.split()
	G = G.split()
	N, S, B = (int(i) for i in G)
	highly = int(H[0])
	for x in range(1, N):
		for y in range(S):
			highly += B
			if highly >= int(H[x]):
				highly = int(H[x])
	if highly == int(H[-1]):
		print('Yes')
	else:
		print('No')
if __name__ == '__main__':
	main()