P = list(range(10**6+1))
for i in range(2,10**6+1):
    if i*i>10**6:break
    for j in range(i*i,10**6+1,i):
        P[j] = P[i]
Q = []
for i in range(2,10**6+1):
    if P[i]==i:
        Q.append(i)
X,A,Y,B = map(int,input().split())
Cx = {}
x = X
for p in Q:
    if x==1:break
    while x%p==0:
        Cx[p] = Cx.get(p,0)+1
        x //= p
if x>1:
    Cx[x] = Cx.get(x,0)+1
Cy = {}
x = Y
for p in Q:
    if x==1:break
    while x%p==0:
        Cy[p] = Cy.get(p,0)+1
        x //= p
if x>1:
    Cy[x] = Cy.get(x,0)+1
flag = "Yes"
for p in Cy:
    if p not in Cx:
        flag = "No"
        break
    if Cy[p]*B>Cx[p]*A:
        flag = "No"
        break
print(flag)