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

if N == 1:
    print('Yes')
    exit()
highest = H[0]
possible = H[0] + S*B
for h in H[1:]:
    if h > possible:
        print('No')
        exit()
    if h > highest:
        highest = h
        possible = h + S*B
print('Yes')