class dp{
//dp
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int m = sc.nextInt();
int[][] f = new int[40][40];
f[1][1] = 1;
for (int i = 1; i < n; i++) {
for (int j = 1; j < m; j++) {
if(i == 1 && j == 1)continue;
if((i & 1) != 0 || (j & 1) != 1){
f[i][j] = f[i - 1][j] + f[i][j - 1];
}
}
}
System.out.println(f[n][m]);
}
}