#include<iostream>

using namespace std;
const int N = 32;
int f[N][N];
int n, m;

int main()
{
    cin >> n >> m;

    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 % 2 || j % 2)
                f[i][j] = f[i - 1][j] + f[i][j - 1];

        }

    cout << f[n][m] << endl;

    return 0;
}