import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
      	String result = "";
		int battleCount = 0;

      	while(a > 0 && c > 0){
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        }

		result = battleCount % 2 == 0 ? "No" : "Yes";
		System.out.println(result);
    }
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
      	String result = "";
		int battleCount = 0;

      	while(a > 0 && c > 0){
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        }

		result = battleCount % 2 == 0 ? "No" : "Yes";
		System.out.println(result);
    }
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
      	String result = "";
		int battleCount = 0;

      	while(a > 0 && c > 0){
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        }

		result = battleCount % 2 == 0 ? "No" : "Yes";
		System.out.println(result);
    } main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
      	String result = "";
		int battleCount = 0;

      	while(a > 0 && c > 0){
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        }

		result = battleCount % 2 == 0 ? "No" : "Yes";
		System.out.println(result);
    } 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 String result = ""; result "" int battleCount = 0; battleCount 0 while(a > 0 && c > 0){
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        } a > 0 && c > 0 a > 0 a 0 c > 0 c 0 {
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        } battleCount += 1 battleCount 1 if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          } battleCount % 2 == 0 battleCount % 2 battleCount 2 0 {
            a -= d;
          } a -= d a d {
            c -= b;
          } c -= b c b result = battleCount % 2 == 0 ? "No" : "Yes" result battleCount % 2 == 0 ? "No" : "Yes" battleCount % 2 == 0 battleCount % 2 battleCount 2 0 "No" "Yes" System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
      	String result = "";
		int battleCount = 0;

      	while(a > 0 && c > 0){
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        }

		result = battleCount % 2 == 0 ? "No" : "Yes";
		System.out.println(result);
    }
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
      	String result = "";
		int battleCount = 0;

      	while(a > 0 && c > 0){
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        }

		result = battleCount % 2 == 0 ? "No" : "Yes";
		System.out.println(result);
    }
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
      	String result = "";
		int battleCount = 0;

      	while(a > 0 && c > 0){
          battleCount += 1;
          if(battleCount % 2 == 0){
            a -= d;
          }
          else{
            c -= b;
          }
        }

		result = battleCount % 2 == 0 ? "No" : "Yes";
		System.out.println(result);
    }
}