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

INF = 10**18
MAX = H[0] + S*B
for i in range(1,N):
    if(MAX < H[i]):
        print("No")
        exit()
    else:
        MAX = max(MAX,H[i] + S*B)

print("Yes")