from collections import defaultdict
X,A,Y,B=map(int,input().split())
class get_prime():#使うたびにクラスの定義が必要。self.revの使い回しNG
    def __init__(self):
        self.rev = []
    def prime(self,n):
        if n == 1:
            return self.rev
        for i in range(2,int(n**0.5)+1):
            if n % i == 0:
                self.rev.append(i)
                self.prime(int(n/i))
                break
        else:
            self.rev.append(n)
        return self.rev
x = get_prime()
y = get_prime()
primeX = x.prime(X)
primeY= y.prime(Y)
dicX = defaultdict(int) 
dicY = defaultdict(int)
for p in primeX:
    dicX[p] += 1
for p in primeY:
    dicY[p] += 1
def check():
    if dicX.keys() >= dicY.keys():
        return True
    else:
        return False
if check():
    flag = True
    for p in dicX.keys():
        if dicX[p] * A >= dicY[p] * B:
            pass
        else:
            flag = False
    if flag:
        print('Yes')
    else:
        print('No')
else:
    print('No')