from collections import *

def factorization(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])

    return arr


X, A, Y, B = map(int, input().split())
DX, DY = defaultdict(int), defaultdict(int)
LX, LY = factorization(X), factorization(Y)
for n, ind in LX:
    DX[n] = ind * A
for n, ind in LY:
    DY[n] = ind * B
    
for k, v in DY.items():
    if v > DX[k]:
        print("No")
        exit()
print("Yes")