from collections import *

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 x == 1:
    if y == 1:
        print("Yes")
        exit()
    else:
        print("No")
        exit()

if y == 1:
    print("Yes")
    exit()

xl, yl = factorization(x), factorization(y)

dx, dy = defaultdict(int), defaultdict(int)

for li in xl:
    num, j = li
    dx[num] = j * a

for li in yl:
    num, j = li
    if dx[num] < j * b:
        print("No")
        exit()

print("Yes")