#include<bits/stdc++.h>
using namespace std;
int f[31][31],i,j,m,n;
int main()
{
    cin>>n>>m;
    f[0][1]=1;
    for(int i=1; i<=m; i++)
        for(int j=1; j<=n; j++)
            if(j==1)
                f[i][j]=f[i-1][n]+f[i-1][2];
            else if(j==n)
                f[i][j]=f[i-1][1]+f[i-1][n-1];
            else
                f[i][j]=f[i-1][j-1]+f[i-1][j+1];
    cout<<f[m][1]<<endl;
    return 0;
}


/**************************************************************
	Problem: 1801
	User: admin
	Language: C++
	Result: Accepted
	Time:48 ms
	Memory:2076 kb
****************************************************************/