#include<iostream>

using namespace std;

int num;
int n,m;
int dfs(int x,int y)
{
    if(x==n&&y==m) num++;
    else 
    if(x<=n)
    dfs(x+1,y);
    if(y<=m)
    dfs(x,y+1);
    return num;
}
int main()
{

    cin>>n>>m;
    cout<<dfs(0,0)<<endl;
}