x, a, y, b = map(int, input().split())

from collections import defaultdict
def prime_factorize(n):
    prime_dict = defaultdict(int)
    n_c = n
    while n % 2 == 0:
        prime_dict[2] += 1
        n //= 2
    f = 3
    while f * f <= n_c:
        while n % f == 0:
            prime_dict[f] += 1
            n //= f
        f += 2
    if n != 1:
        prime_dict[n] += 1
    return prime_dict

x_prime = prime_factorize(x)
y_prime = prime_factorize(y)
x_prime_set = set([prime for prime in x_prime.keys()])
y_prime_set = set([prime for prime in y_prime.keys()])
if x_prime_set & y_prime_set != y_prime_set:
    print("No")
    exit()

for prime in x_prime.keys():
    if x_prime[prime] * a < y_prime[prime] * b:
        print("No")
        exit()
print("Yes")