#include<iostream>
using namespace std;
int f(int x,int y,int n,int m)
{
static int sum=0;
if(x==n&&y==m)
{
sum++;
}
if (x<n)
{
f(x+1,y,n,m);
}
if(y<m)
{
f(x,y+1,n,m);
}
else
{
return sum;
}
}
int main ()
{
int n,m;
cin>>n>>m;
cout<<f(0,0,n,m)<<endl;
return 0;
}