#include <bits/stdc++.h>

using i32 = std::int32_t;
using u32 = std::uint32_t;
using i64 = std::int64_t;
using u64 = std::uint64_t;
using isize = std::ptrdiff_t;
using usize = std::size_t;

class rep {
    struct Iter {
        usize itr;
        constexpr Iter(const usize pos) noexcept : itr(pos) {}
        constexpr void operator++() noexcept { ++itr; }
        constexpr bool operator!=(const Iter& other) const noexcept { return itr != other.itr; }
        constexpr usize operator*() const noexcept { return itr; }
    };
    const Iter first, last;

  public:
    explicit constexpr rep(const usize first, const usize last) noexcept : first(first), last(std::max(first, last)) {}
    constexpr Iter begin() const noexcept { return first; }
    constexpr Iter end() const noexcept { return last; }
};

template <class T> std::vector<std::pair<T, usize>> factorize(T x) {
    assert(x > 0);
    std::vector<std::pair<T, usize>> ret;
    for (T i = 2; i * i <= x; ++i) {
        if (x % i == 0) {
            ret.emplace_back(i, 0);
            while (x % i == 0) {
                ret.back().second++;
                x /= i;
            }
        }
    }
    if (x > 1) {
        ret.emplace_back(x, 1);
    }
    return ret;
}

template <class T> using Vec = std::vector<T>;

void main_() {
    i64 X, A, Y, B;
    std::cin >> X >> A >> Y >> B;
    for (const auto& [p, e] : factorize(Y)) {
        usize c = 0;
        while (X % p == 0) {
            c += 1;
            X /= p;
        }
        if (c * A < e * B) {
            std::cout << "No\n";
            return;
        }
    }
    std::cout << "Yes\n";
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    main_();
    return 0;
}