import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main
{
	public static void main(String[] Arguments) throws IOException 
	{
		BufferedReader BR = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer ST = new StringTokenizer(BR.readLine());
		int A = Integer.parseInt(ST.nextToken()), B = Integer.parseInt(ST.nextToken()), C = Integer.parseInt(ST.nextToken()), D = Integer.parseInt(ST.nextToken());
		boolean takaTurn = true;
		while (A > 0 && C > 0)
		{
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		}
		System.out.println((A > 0) ? "Yes" : "No");
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main
{
	public static void main(String[] Arguments) throws IOException 
	{
		BufferedReader BR = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer ST = new StringTokenizer(BR.readLine());
		int A = Integer.parseInt(ST.nextToken()), B = Integer.parseInt(ST.nextToken()), C = Integer.parseInt(ST.nextToken()), D = Integer.parseInt(ST.nextToken());
		boolean takaTurn = true;
		while (A > 0 && C > 0)
		{
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		}
		System.out.println((A > 0) ? "Yes" : "No");
	}
} Main public static void main(String[] Arguments) throws IOException 
	{
		BufferedReader BR = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer ST = new StringTokenizer(BR.readLine());
		int A = Integer.parseInt(ST.nextToken()), B = Integer.parseInt(ST.nextToken()), C = Integer.parseInt(ST.nextToken()), D = Integer.parseInt(ST.nextToken());
		boolean takaTurn = true;
		while (A > 0 && C > 0)
		{
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		}
		System.out.println((A > 0) ? "Yes" : "No");
	} main {
		BufferedReader BR = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer ST = new StringTokenizer(BR.readLine());
		int A = Integer.parseInt(ST.nextToken()), B = Integer.parseInt(ST.nextToken()), C = Integer.parseInt(ST.nextToken()), D = Integer.parseInt(ST.nextToken());
		boolean takaTurn = true;
		while (A > 0 && C > 0)
		{
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		}
		System.out.println((A > 0) ? "Yes" : "No");
	} BufferedReader BR = new BufferedReader(new InputStreamReader(System.in)); BR new BufferedReader(new InputStreamReader(System.in)) StringTokenizer ST = new StringTokenizer(BR.readLine()); ST new StringTokenizer(BR.readLine()) int A = Integer.parseInt(ST.nextToken()) A Integer.parseInt(ST.nextToken()) Integer.parseInt Integer ST.nextToken() ST.nextToken ST B = Integer.parseInt(ST.nextToken()) B Integer.parseInt(ST.nextToken()) Integer.parseInt Integer ST.nextToken() ST.nextToken ST C = Integer.parseInt(ST.nextToken()) C Integer.parseInt(ST.nextToken()) Integer.parseInt Integer ST.nextToken() ST.nextToken ST D = Integer.parseInt(ST.nextToken()); D Integer.parseInt(ST.nextToken()) Integer.parseInt Integer ST.nextToken() ST.nextToken ST boolean takaTurn = true; takaTurn true while (A > 0 && C > 0)
		{
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		} A > 0 && C > 0 A > 0 A 0 C > 0 C 0 {
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		} if (takaTurn) C -= B;
			else A -= D; takaTurn C -= B C B A -= D A D takaTurn = !takaTurn takaTurn !takaTurn takaTurn System.out.println((A > 0) ? "Yes" : "No") System.out.println System.out System System.out (A > 0) ? "Yes" : "No" (A > 0) A 0 "Yes" "No" String[] Arguments Arguments public class Main
{
	public static void main(String[] Arguments) throws IOException 
	{
		BufferedReader BR = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer ST = new StringTokenizer(BR.readLine());
		int A = Integer.parseInt(ST.nextToken()), B = Integer.parseInt(ST.nextToken()), C = Integer.parseInt(ST.nextToken()), D = Integer.parseInt(ST.nextToken());
		boolean takaTurn = true;
		while (A > 0 && C > 0)
		{
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		}
		System.out.println((A > 0) ? "Yes" : "No");
	}
} public class Main
{
	public static void main(String[] Arguments) throws IOException 
	{
		BufferedReader BR = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer ST = new StringTokenizer(BR.readLine());
		int A = Integer.parseInt(ST.nextToken()), B = Integer.parseInt(ST.nextToken()), C = Integer.parseInt(ST.nextToken()), D = Integer.parseInt(ST.nextToken());
		boolean takaTurn = true;
		while (A > 0 && C > 0)
		{
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		}
		System.out.println((A > 0) ? "Yes" : "No");
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main
{
	public static void main(String[] Arguments) throws IOException 
	{
		BufferedReader BR = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer ST = new StringTokenizer(BR.readLine());
		int A = Integer.parseInt(ST.nextToken()), B = Integer.parseInt(ST.nextToken()), C = Integer.parseInt(ST.nextToken()), D = Integer.parseInt(ST.nextToken());
		boolean takaTurn = true;
		while (A > 0 && C > 0)
		{
			if (takaTurn) C -= B;
			else A -= D;
			takaTurn = !takaTurn;
		}
		System.out.println((A > 0) ? "Yes" : "No");
	}
}
