N,S,B=map(int,input().split())
H=list(map(int,input().split()))
queue=[]
for h in H:
    if queue and queue[-1]>h:
        continue
    queue.append(h)
H=queue
N=len(H)
ans="Yes"
for i in range(1,N):
    if H[i-1]+S*B<H[i]:
        ans="No"
print(ans)