#include<iostream>

#include<cstdio>

#include<cmath>

using namespace std;

int f[998][998];

int main(){

 freopen("horse.in", "r", stdin);

 freopen("horse.out", "w", stdout);

 int n, m, i, j;

 scanf("%d%d", &m, &n);

 f[1][1] = 1;

 for (i = 2; i <= n; ++i)

 for (j = 1; j <= m; ++j)

 f[i][j] = f[i - 2][j - 1] + f[i - 2][j + 1] + f[i - 1][j - 2] + f[i - 1][j + 2];

 printf("%d\n", f[n][m]);

 return 0;

}