import sys

# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
dij = [(0, 1), (1, 0), (0, -1), (-1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = 1 << 63
# md = 998244353
md = 10**9+7

# (底,指数)を返す
# 18=2**1 * 3**2なので[(2,1),(3,2)]
def PrimeFactorization(x):
    def plist(x):
        if x < 2: return []
        if x & 1 == 0: return [2]+plist(x >> 1)
        for p in range(3, x+1, 2):
            if x%p == 0: return [p]+plist(x//p)
            if p**2 > x: return [x]

    pl = plist(x)
    pp, ee = [], []
    for p in pl:
        if not pp or p != pp[-1]:
            pp += [p]
            ee += [0]
        ee[-1] += 1
    return pp, ee

from collections import Counter

x, a, y, b = LI()

def cntp(a):
    ca = Counter()
    pp, ee = PrimeFactorization(a)
    for p, e in zip(pp, ee):
        ca[p] = e
    return ca

def solve():
    cx = cntp(x)
    cy = cntp(y)

    for p, e in cy.items():
        if e*b > cx[p]*a: return False
    return True

print("Yes" if solve() else "No")