code

#include<iostream>
#include<algorithm>
#include<cstring>
using namespace std;
int b[40][40];
int  main(){
	int n,m;
	cin>>n>>m;
	b[0][0]=1;//initialize
	for(int i=1;i<=m;i++){
		for(int j=0;j<n;j++){
			if(j==0){//special point
				b[i][0]=b[i-1][1]+b[i-1][n-1];
			}else if(j==n-1){
				b[i][n-1]=b[i-1][0]+b[i-1][n-2];
			}else{
				b[i][j]=b[i-1][j-1]+b[i-1][j+1];
			}
			
		}
	}
	cout<<b[m][0];
	return 0;
}