import java.util.*;

class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();
        double d = sc.nextDouble();

        System.out.println(Math.ceil(a/d) >= Math.ceil(c/b)? "Yes" : "No");
    }
} import java.util.*; util.* java class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();
        double d = sc.nextDouble();

        System.out.println(Math.ceil(a/d) >= Math.ceil(c/b)? "Yes" : "No");
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();
        double d = sc.nextDouble();

        System.out.println(Math.ceil(a/d) >= Math.ceil(c/b)? "Yes" : "No");
    } main {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();
        double d = sc.nextDouble();

        System.out.println(Math.ceil(a/d) >= Math.ceil(c/b)? "Yes" : "No");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) double a = sc.nextDouble(); a sc.nextDouble() sc.nextDouble sc double b = sc.nextDouble(); b sc.nextDouble() sc.nextDouble sc double c = sc.nextDouble(); c sc.nextDouble() sc.nextDouble sc double d = sc.nextDouble(); d sc.nextDouble() sc.nextDouble sc System.out.println(Math.ceil(a/d) >= Math.ceil(c/b)? "Yes" : "No") System.out.println System.out System System.out Math.ceil(a/d) >= Math.ceil(c/b)? "Yes" : "No" Math.ceil(a/d) >= Math.ceil(c/b) Math.ceil(a/d) Math.ceil Math a/d a d Math.ceil(c/b) Math.ceil Math c/b c b "Yes" "No" String[] args args
import java.util.*;

class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();
        double d = sc.nextDouble();

        System.out.println(Math.ceil(a/d) >= Math.ceil(c/b)? "Yes" : "No");
    }
}