#include <iostream>
using namespace std;
const int N = 15;
int n,m;
int ans;
void dfs(int x,int y){
if(x == n && y == m) ans++;
else{
if(x < n) dfs(x + 1,y);
if(y < m) dfs(x,y + 1);
}
}
int main(){
cin >> n >> m;
dfs(0,0);
cout << ans << endl;
return 0;
}