import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int a=sc.nextInt(),b=sc.nextInt();
		
		int i=0;
		for(;a>0&&b>0;i++){
			if(i%2==0)a--;
			if(i%2==1)b--;
		}
		System.out.println(i);
		sc.close();
		return;
	}
}