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