#include<iostream>

using namespace std;

int dp[40][40];
int n,m;
int main(void) 
{

    cin>>n>>m;
    dp[1][1] = 1;
    for(int i = 1;i <= n;i++) {
        for(int j = 1;j <= m;j++) {
            if((i%2 == 0&&j%2 == 0) || (i == 1&&j == 1)) {
                continue;
            }
            dp[i][j] += dp[i-1][j]+dp[i][j-1];
        }
    }
    cout<<dp[n][m]<<endl;
    return 0;
}