import java.util.*;
class Main{
static int d[][];
static int ans=0;
static int f(int x,int y) {

    if(x>n||y>m) {
        return 0;
    }
    if(x==n&&y==m) {
        return 1;
    }if(d[x][y]>0) {
        return d[x][y];
    }
    if(x%2==0&&y%2==0) {
        return 0;
    }
    d[x][y]+=f(x+1,y);
    d[x][y]+=f(x,y+1);
    return d[x][y];
}
static int n;
static int m;
public static void main(String[] args) {
    Scanner in =new Scanner(System.in);
     n=in.nextInt();
     m=in.nextInt();
    d=new int [n+1][m+1];
    if(n%2==0&&m%2==0) {
        System.out.println(0);
        return;
    }
    System.out.println(f(1,1));
}

}