
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        //コード
        Scanner scanner = new Scanner(System.in);
        Integer a = Integer.parseInt(scanner.next());
        Integer b = Integer.parseInt(scanner.next());
        Integer c = Integer.parseInt(scanner.next());
        Integer d = Integer.parseInt(scanner.next());

        int count_a = 0;
        for(int i =0; i < 101; i++) {
            a -= d;
            if(a <= 0) break;
            count_a++;
        }

        int count_b = 0;
        for(int j =0; j < 101; j++) {
            c -= b;
            if(c <= 0) break;
            count_b++;
        }

        if(count_a >= count_b) {
            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) {
        //コード
        Scanner scanner = new Scanner(System.in);
        Integer a = Integer.parseInt(scanner.next());
        Integer b = Integer.parseInt(scanner.next());
        Integer c = Integer.parseInt(scanner.next());
        Integer d = Integer.parseInt(scanner.next());

        int count_a = 0;
        for(int i =0; i < 101; i++) {
            a -= d;
            if(a <= 0) break;
            count_a++;
        }

        int count_b = 0;
        for(int j =0; j < 101; j++) {
            c -= b;
            if(c <= 0) break;
            count_b++;
        }

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

        }
    }
} Main public static void main(String[] args) {
        //コード
        Scanner scanner = new Scanner(System.in);
        Integer a = Integer.parseInt(scanner.next());
        Integer b = Integer.parseInt(scanner.next());
        Integer c = Integer.parseInt(scanner.next());
        Integer d = Integer.parseInt(scanner.next());

        int count_a = 0;
        for(int i =0; i < 101; i++) {
            a -= d;
            if(a <= 0) break;
            count_a++;
        }

        int count_b = 0;
        for(int j =0; j < 101; j++) {
            c -= b;
            if(c <= 0) break;
            count_b++;
        }

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

        }
    } main {
        //コード
        Scanner scanner = new Scanner(System.in);
        Integer a = Integer.parseInt(scanner.next());
        Integer b = Integer.parseInt(scanner.next());
        Integer c = Integer.parseInt(scanner.next());
        Integer d = Integer.parseInt(scanner.next());

        int count_a = 0;
        for(int i =0; i < 101; i++) {
            a -= d;
            if(a <= 0) break;
            count_a++;
        }

        int count_b = 0;
        for(int j =0; j < 101; j++) {
            c -= b;
            if(c <= 0) break;
            count_b++;
        }

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

        }
    } Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) Integer a = Integer.parseInt(scanner.next()); a Integer.parseInt(scanner.next()) Integer.parseInt Integer scanner.next() scanner.next scanner Integer b = Integer.parseInt(scanner.next()); b Integer.parseInt(scanner.next()) Integer.parseInt Integer scanner.next() scanner.next scanner Integer c = Integer.parseInt(scanner.next()); c Integer.parseInt(scanner.next()) Integer.parseInt Integer scanner.next() scanner.next scanner Integer d = Integer.parseInt(scanner.next()); d Integer.parseInt(scanner.next()) Integer.parseInt Integer scanner.next() scanner.next scanner int count_a = 0; count_a 0 for(int i =0; i < 101; i++) {
            a -= d;
            if(a <= 0) break;
            count_a++;
        } int i =0; int i =0; i 0 i < 101 i 101 i++ i++ i {
            a -= d;
            if(a <= 0) break;
            count_a++;
        } {
            a -= d;
            if(a <= 0) break;
            count_a++;
        } a -= d a d if(a <= 0) break; a <= 0 a 0 break; count_a++ count_a int count_b = 0; count_b 0 for(int j =0; j < 101; j++) {
            c -= b;
            if(c <= 0) break;
            count_b++;
        } int j =0; int j =0; j 0 j < 101 j 101 j++ j++ j {
            c -= b;
            if(c <= 0) break;
            count_b++;
        } {
            c -= b;
            if(c <= 0) break;
            count_b++;
        } c -= b c b if(c <= 0) break; c <= 0 c 0 break; count_b++ count_b if(count_a >= count_b) {
            System.out.println("Yes");
        } else {
            System.out.println("No");

        } count_a >= count_b count_a count_b {
            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) {
        //コード
        Scanner scanner = new Scanner(System.in);
        Integer a = Integer.parseInt(scanner.next());
        Integer b = Integer.parseInt(scanner.next());
        Integer c = Integer.parseInt(scanner.next());
        Integer d = Integer.parseInt(scanner.next());

        int count_a = 0;
        for(int i =0; i < 101; i++) {
            a -= d;
            if(a <= 0) break;
            count_a++;
        }

        int count_b = 0;
        for(int j =0; j < 101; j++) {
            c -= b;
            if(c <= 0) break;
            count_b++;
        }

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

        }
    }
} public class Main {
    public static void main(String[] args) {
        //コード
        Scanner scanner = new Scanner(System.in);
        Integer a = Integer.parseInt(scanner.next());
        Integer b = Integer.parseInt(scanner.next());
        Integer c = Integer.parseInt(scanner.next());
        Integer d = Integer.parseInt(scanner.next());

        int count_a = 0;
        for(int i =0; i < 101; i++) {
            a -= d;
            if(a <= 0) break;
            count_a++;
        }

        int count_b = 0;
        for(int j =0; j < 101; j++) {
            c -= b;
            if(c <= 0) break;
            count_b++;
        }

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

        }
    }
} Main

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        //コード
        Scanner scanner = new Scanner(System.in);
        Integer a = Integer.parseInt(scanner.next());
        Integer b = Integer.parseInt(scanner.next());
        Integer c = Integer.parseInt(scanner.next());
        Integer d = Integer.parseInt(scanner.next());

        int count_a = 0;
        for(int i =0; i < 101; i++) {
            a -= d;
            if(a <= 0) break;
            count_a++;
        }

        int count_b = 0;
        for(int j =0; j < 101; j++) {
            c -= b;
            if(c <= 0) break;
            count_b++;
        }

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

        }
    }
}
