import sys
#sys.setrecursionlimit(10 ** 6)
INF = float('inf')
#10**20,2**63に変えるのもあり
MOD = 10**9 + 7
MOD2 = 998244353
from collections import defaultdict
def solve():
    def II(): return int(sys.stdin.readline())
    def LI(): return list(map(int, sys.stdin.readline().split()))
    def LC(): return list(input())
    def IC(): return [int(c) for c in input()]
    def MI(): return map(int, sys.stdin.readline().split())
    X,A,Y,B = MI()
    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
    Xdiv = prime_factorize(X)
    Ydiv = prime_factorize(Y)
    XdivNum = defaultdict(lambda:0)
    YdivNum = defaultdict(lambda:0)
    for x in Xdiv:
        XdivNum[x] += 1
    for y in Ydiv:
        YdivNum[y] += 1
    Flag = True
    for y in YdivNum.keys():
        if not XdivNum[y]*A >= YdivNum[y]*B:
            Flag = False
    if Flag:
        print("Yes")
    else:
        print("No")
    return
solve()