def factorization(N):#素因数分解√N
    arr = []
    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
            arr.append([i, cnt])
    if temp!=1:
        arr.append([temp, 1])
    if arr==[]:
        arr.append([N, 1])
    return arr #[素因数、個数]
import collections
X,A,Y,B = map(int,input().split())

Xarr = factorization(X)
Yarr = factorization(Y)
Xcnt = collections.Counter()
Ycnt = collections.Counter()
for v,a in Xarr:
    Xcnt[v] = a*A
for v,b in Yarr:
    Ycnt[v] = b*B

if Y == 1:
    print('Yes')
    exit()

flag = True
for v,b in Ycnt.items():
    if Xcnt[v] >= b:
        continue
    print('No')
    break
else:
    print('Yes')