1

#include<iostream>
using namespace std;
int main(){
int i,j, n,m;
cin >> n >> m;
long a[40][40]={};
a[0][1]=1;
a[0][n+1]=1;
for(int i=1;i<=m;i++){
for(int j=1;j<=n+1;j++){
a[i][j]=a[i-1][j-1]+a[i-1][j+1];
}
a[i][1]=a[i][n+1]=a[i][1]+a[i][n+1];
}
cout<<a[m][1]<<endl;
return 0;
}