import sys
readline=sys.stdin.readline
from collections import defaultdict

def Divisors(N):
    divisors=[]
    for i in range(1,N+1):
        if i**2>=N:
            break
        elif N%i==0:
            divisors.append(i)
    if i**2==N:
        divisors+=[i]+[N//i for i in divisors[::-1]]
    else:
        divisors+=[N//i for i in divisors[::-1]]
    return divisors

def Factorize(N):
    assert N>=1
    factors=defaultdict(int)
    for p in range(2,N):
        if p**2>N:
            break
        while N%p==0:
            factors[p]+=1
            N//=p
    if N!=1:
        factors[N]+=1
    return factors

X,A,Y,B=map(int,readline().split())
factX=Factorize(X)
factY=Factorize(Y)
ans="Yes"
for p,e in factY.items():
    if A*factX[p]<e*B:
        ans="No"
print(ans)