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
    mx, mx_i = -1, -1
    x = now
    while x+1 < N and H[x+1] <= Y:
        if H[x+1] > mx:
            mx = H[x+1]
            mx_i = x+1
        x += 1
    if mx == -1:
        print("No")
        exit()
    if x == N-1:
        print("Yes")
        exit()
    Y = mx
    now = mx_i