#include<iostream>

using namespace std;

int n,m;
int cnt; //cnt不用初始化为0

void f(int x,int y)
{
    if(x==n&&y==m) cnt++;
    else
    {
        if(x<n) f(x+1,y);
        if(y<m) f(x,y+1);
    }
}
int main()
{
    cin>>n>>m;
    f(0,0);

    cout<<cnt<<endl;

    return 0;
}