#include <bits/stdc++.h>
// #include <boost/multiprecision/cpp_int.hpp>
using namespace std;
// using bigint = boost::multiprecision::cpp_int;

template <typename T> using min_priority_queue = priority_queue<T,vector<T>,greater<T>>;

random_device seed_gen;
mt19937 engine(seed_gen());

int64_t get_time_ns(){
    struct::timespec t;
    clock_gettime(CLOCK_MONOTONIC, &t);
    return t.tv_sec * int64_t(1'000'000'000) + t.tv_nsec;
}

int main() {
    int64_t h, w, n, k;
    cin >> h >> w >> n >> k;
    k--;

    int64_t l = h * w % n;
    l += n-1;
    l %= n;

    if(k == l) cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}