n,S,B=map(int,input().split())
h=list(map(int,input().split()))
q=[]
for v in h:
  if len(q)==0 or q[-1]<v:
    q+=[v]
p=h[0]+S*B
for v in q:
  if p<v:
    print("No")
    exit()
  p=v+S*B
print("Yes")