#include #define rep(i, a, n) for (int i = a; i < n; i++) #define repr(i, a, n) for (int i = n - 1; i >= a; i--) using namespace std; using ll = long long; using P = pair; template void chmin(T &a, T b) { a = min(a, b); } template void chmax(T &a, T b) { a = max(a, b); } int main() { ios::sync_with_stdio(false); cin.tie(0); int l, r, m, k; cin >> l >> r >> m >> k; if (k == 0) { cout << "Yes" << endl; return 0; } int x = m / k; if (m % k) x++; if (x >= l && x <= r) cout << "Yes" << endl; else cout << "No" << endl; }