N,S,B=map(int,input().split())

H=list(map(int,input().split()))

now=0
MAX=H[0]
OK=[0]*N
OK[0]=1

for i in range(N):
    if H[i]<=MAX:
        OK[i]=1
    else:
        print("No")
        exit()
        
    if OK[i]==1:
        MAX=max(MAX,H[i]+S*B)

print("Yes")