from collections import defaultdict
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])
    if arr==[]:
        arr.append([n, 1])
    return arr
x,a,y,b=map(int,input().split())
if y==1:
    print('Yes')
    exit()
X=factorization(x)
dx=defaultdict(int)
dy=defaultdict(int)
Y=factorization(y)
for key,val in X:
    dx[key]=val*a
for key,val in Y:
    dy[key]=val*b
for key,val in dy.items():
    if key not in dx:
        print('No')
        exit()
    dx[key]-=val
    if dx[key]<0:
        print('No')
        exit()
print('Yes')