n, s, b = map(int, input().split())
hl = list(map(int, input().split()))
h = hl[0]
h_max = h
for g in hl[1:]:
    if h + s*b < g and h_max < g:
        print("No")
        exit()
    h_max = max(h_max, h + s*b)
    h = g
print("Yes")