include[HTML_REMOVED]

using namespace std;
const int N = 35;
int f[N+10][N+10];
int n,m;

void init(){
f[1][1]=1;

for(int i=1;i<=N;i++){
    for(int j=1;j<=N;j++){
        if(i==1&&j==1) continue;
        if(i%2==0&&j%2==0) continue;
        else f[i][j]=f[i-1][j]+f[i][j-1];
    }
}

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

cout<<f[n][m]<<endl;
return 0;

}