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

ok_H = H[0]+S*B
for Hi in H:
    if Hi > ok_H:
        break
    ok_H = max(ok_H, Hi+S*B)

if ok_H >= H[-1]:
    print("Yes")
else:
    print("No")