#X**AはY**Bで割り切れるか判定するプログラム
import collections
import math
def prime_factorize(n):
    a = []
    while n % 2 == 0:
        a.append(2)
        n //= 2
    f = 3
    while f * f <= n:
        if n % f == 0:
            a.append(f)
            n //= f
        else:
            f += 2
    if n != 1:
        a.append(n)
    return a

def main():
  X,A,Y,B = map(int, input().split( ))
  j=1
  S = collections.Counter(prime_factorize(X))
  T = collections.Counter(prime_factorize(Y))
  for num in range(len(T)):
    i=T.most_common()[num][0]
    if A*S[i] < B*T[i]:
     print("No")
     j=-1
     break
  if j>0:
    print("Yes")

if __name__ == '__main__':
  main()