X, A, Y, B = map(int, input().split())
if Y == 1:
    print("Yes")
    exit()


def factorization(n):
    fact = dict()
    temp = n
    for i in range(2, int(-(-(n ** 0.5) // 1)) + 1):
        if temp % i == 0:
            cnt = 0
            while temp % i == 0:
                cnt += 1
                temp //= i
            fact[i] = cnt

    if temp != 1:
        fact[temp] = 1

    if not fact:
        fact[n] = 1

    return fact


fact_x_power_of_a = {p: cnt * A for p, cnt in factorization(X).items()}
fact_y_power_of_b = {p: cnt * B for p, cnt in factorization(Y).items()}

flg = True
for p in fact_y_power_of_b:
    try:
        if fact_x_power_of_a[p] < fact_y_power_of_b[p]:
            flg = False
    except KeyError:
        flg = False

print("Yes" if flg else "No")