#include <iostream>

using namespace std;
int main(){
	int n,m;
	cin >> n >> m;

	int board[n][m];

	for(int i=0; i < n; i++){
		for(int j=0; j<m; j++){
			board[i][j] = 0;
		}
	}

	board[0][0] = 1;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			int temp = 0;
			if(i >= 1 && j >= 2){
				temp += board[i-1][j-2];
			}

			if(i >= 2 && j >= 1){
					temp += board[i-2][j-1];
			}

			board[i][j] += temp;
		}
	}


	cout << board[n-1][m-1] << endl;


}