x,a,y,b = map(int,input().split())

dx = dict()
dy = dict()

C = 10 ** 6
dat = [0] * C
for i in range(2,C):
    if dat[i] == 0:
        for j in range(2 * i,C,i):
            dat[j] = 1
        if x % i == 0:
            x //= i
            count = 1
            while x % i == 0:
                x //= i
                count += 1
            dx[i] = count
        if y % i == 0:
            y //= i
            count = 1
            while y % i == 0:
                y //= i
                count += 1
            dy[i] = count
if x != 1:
    dx[x] = 1
if y != 1:
    dy[y] = 1
import sys
for p in dy:
    c = dy[p] * b
    if p not in dx:
        print('No')
        exit()
    cc = dx[p] * a
    if cc < c:
        print('No')
        exit()
print('Yes')