import java.util.*;
import java.io.*;

public class grid {
    static long x,y;
    static long [][] ways;
    public static final String INFILE="grid.in";
    public static void main(String[] args) throws Exception{
	long count;
	BufferedReader br= new BufferedReader(new InputStreamReader(new FileInputStream(INFILE)));
	StringTokenizer tok;
	try {
	    while (true) {
		String inline=br.readLine();
		if (inline== null)
		    return;
		tok=new StringTokenizer(inline);
		x=Long.parseLong(tok.nextToken(" "));
		y=Long.parseLong(tok.nextToken(" "));
		if (x==0 && y==0)
		    return;
		ways=new long[(int)x][(int)y];
		/* for (int x=0;x<ways.length;x++)
		   Arrays.fill(ways[x], 0); */
		count=walk(0,1);
		count+=walk(1,0);
		System.out.println(String.valueOf(count));
	    }
	} catch (Throwable e) {
	    e.printStackTrace();
	    System.exit(1);
	}
    }
    public static long walk (long cx, long cy) {
	if (cx==x ||cy==y)
	    return 1;
	if (ways[(int)cx][(int)cy] != 0)
	    return ways[(int)cx][(int)cy];
	long wc= walk(cx+1,cy);
	wc+= walk(cx, cy+1);
	ways[(int)cx][(int)cy]=wc;
	return wc;
    }

}