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

now = 0
Y = H[0]

while now < N-1:
    Y += S * B
    ok = False
    while now+1 < N and H[now+1] <= Y:
        now += 1
        ok = True
    Y = H[now]
    if not ok:
        print("No")
        exit()

print("Yes")