#include<iostream>
using namespace std;
const int N=1010;
int g[N][N];
int main()
{
g[1][1]=1;
int n,m;
cin>>n>>m;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(i%2==0 and j%2==0)continue;
if(i==1&&j==1)continue;
g[i][j]=g[i-1][j]+g[i][j-1];
}
}
cout<<g[n][m]<<endl;
return 0;
}