#include <iostream>
using namespace std;
const int N(33);
int f[N][N]={0};
int main()
{
	int n,m;
	cin>>n>>m;
	f[0][0]=1;
	for(int i=1;i<=m;i++)
		for(int j=0;j<n;j++)
			f[i][j]=f[i-1][(j+1)%n]+f[i-1][((j-1)+n)%n];
	cout<<f[m][0]<<endl;
	return 0;
}
/**************************************************************
	Problem: 2278
	User: admin
	Language: C++
	Result: Accepted
	Time:47 ms
	Memory:2076 kb
****************************************************************/