"""

X,Y をそれぞれ素因数分解すればおk

"""

import sys
from sys import stdin

X,A,Y,B = map(int,stdin.readline().split())

XD = {}
YD = {}

for i in range(2,10**6+1):

    if X % i == 0:
        XD[i] = 0

        while X % i == 0:
            XD[i] += 1
            X //= i

if X != 1:
    XD[X] = 1

for i in XD:
    XD[i] *= A



for i in range(2,10**6+1):

    if Y % i == 0:
        YD[i] = 0

        while Y % i == 0:
            YD[i] += 1
            Y //= i
if Y != 1:
    YD[Y] = 1
for i in YD:
    YD[i] *= B

ans = "Yes"
for i in YD:
    if i not in XD or XD[i] < YD[i]:
        ans = "No"
        break

print (ans)