#include <iostream>
using namespace std;
const int N = 40;
int f[N][N];
int main() {
int m, n;
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;
}