from collections import defaultdict
def prime(n):
  m=int(n**0.5)+1
  d=defaultdict(int)
  for i in range(2,m):
    if n%i==0:
      while n%i==0:
        n//=i
        d[i]+=1
  if n!=1:
    d[n]+=1
  return d

x,a,y,b=map(int,input().split())
c=prime(x)
e=prime(y)
flag=True
for key in e:
  if e[key]*b>c[key]*a:
    flag=False
    break
print("Yes" if flag else "No")