mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    def PrimeDecomposition(N):
        ret = {}
        n = int(N ** 0.5)
        for d in range(2, n + 1):
            while N % d == 0:
                if d not in ret:
                    ret[d] = 1
                else:
                    ret[d] += 1
                N //= d
            if N == 1:
                break
        if N != 1:
            ret[N] = 1
        return ret

    x, a, y, b = map(int, input().split())
    px = PrimeDecomposition(x)
    py = PrimeDecomposition(y)
    ok = 1
    for p in py:
        if p not in px:
            ok = 0
            break
        if px[p] * a < py[p] * b:
            ok = 0
            break
    if ok:
        print("Yes")
    else:
        print("No")


if __name__ == '__main__':
    main()