import java.util.Scanner;

public class wonderfulDay {

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

        int max = a + b ;
        int sum = 0;
        for(int i = 2; i <= max; i++){
            sum += 1;
        }
        System.out.println(sum);
    }
}