#include<bits/stdc++.h>
using namespace std;
const int N=3e2+10;
int dp[N][N];
int main(){
	int n,k;scanf("%d%d",&n,&k);
	dp[0][1]=1;
	for(int i=1;i<=k;i++){
		for(int j=1;j<=n;j++){
			if(j==1) dp[i][j]=dp[i-1][n]+dp[i-1][2];
			else if(j==n) dp[i][j]=dp[i-1][1]+dp[i-1][n-1];
			else dp[i][j]=dp[i-1][j-1]+dp[i-1][j+1];
		}
	}
	printf("%d",dp[k][1]);
	return 0;
}

/**************************************************************
	Problem: 1801
	User: liangshinan
	Language: C++
	Result: Accepted
	Time:162 ms
	Memory:2452 kb
****************************************************************/