import sys
input = sys.stdin.readline
import math 

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

# 素因数分解

def fac(x):    
    L=int(math.sqrt(x))

    FACT=dict()

    for i in range(2,L+2):
        while x%i==0:
            FACT[i]=FACT.get(i,0)+1
            x=x//i

    if x!=1:
        FACT[x]=FACT.get(x,0)+1

    return FACT

FX=fac(X)
FY=fac(Y)

flag=1

for fx in FX:
    if fx in FY and FX[fx]*A<FY[fx]*B:
        flag=0

for fy in FY:
    if not(fy in FX):
        flag=0

if flag==1:
    print("Yes")
else:
    print("No")