N,S,B=map(int,input().split())
H=list(map(int,input().split()))
mx=H[0]
for i in range(N):
	rest=H[i]-mx
	for j in range(S):
		rest-=B
	if rest>=0:
		print("No")
		exit()
	mx=max(mx,H[i])
print("Yes")