import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
   		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int m = in.nextInt();

		Solution1_attempt1(n, m);

    }
    	public static void Solution1_attempt1(int n, int m){
		if((n == 1) && (m == 1)){
			System.out.print(0);
		}
	}

}