
import java.util.Scanner;

public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    // 整数の入力
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();

    int ta = (a / d) + (a % d != 0 ? 1 : 0);
    int ao = (c / b) + (c % b != 0 ? 1 : 0);

    if (ta >= ao) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} import java.util.Scanner; Scanner java.util public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    // 整数の入力
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();

    int ta = (a / d) + (a % d != 0 ? 1 : 0);
    int ao = (c / b) + (c % b != 0 ? 1 : 0);

    if (ta >= ao) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} Main public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    // 整数の入力
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();

    int ta = (a / d) + (a % d != 0 ? 1 : 0);
    int ao = (c / b) + (c % b != 0 ? 1 : 0);

    if (ta >= ao) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  } main {

    Scanner sc = new Scanner(System.in);
    // 整数の入力
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();

    int ta = (a / d) + (a % d != 0 ? 1 : 0);
    int ao = (c / b) + (c % b != 0 ? 1 : 0);

    if (ta >= ao) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int ta = (a / d) + (a % d != 0 ? 1 : 0); ta (a / d) + (a % d != 0 ? 1 : 0) (a / d) a d (a % d != 0 ? 1 : 0) a % d != 0 a % d a d 0 1 0 int ao = (c / b) + (c % b != 0 ? 1 : 0); ao (c / b) + (c % b != 0 ? 1 : 0) (c / b) c b (c % b != 0 ? 1 : 0) c % b != 0 c % b c b 0 1 0 if (ta >= ao) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    } ta >= ao ta ao {
      System.out.println("Yes");
    } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
      System.out.println("No");
    } System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    // 整数の入力
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();

    int ta = (a / d) + (a % d != 0 ? 1 : 0);
    int ao = (c / b) + (c % b != 0 ? 1 : 0);

    if (ta >= ao) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    // 整数の入力
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();

    int ta = (a / d) + (a % d != 0 ? 1 : 0);
    int ao = (c / b) + (c % b != 0 ? 1 : 0);

    if (ta >= ao) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
} Main

import java.util.Scanner;

public class Main {

  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    // 整数の入力
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();

    int ta = (a / d) + (a % d != 0 ? 1 : 0);
    int ao = (c / b) + (c % b != 0 ? 1 : 0);

    if (ta >= ao) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
}
