import java.util.Scanner;

class main{
    public static void main(String args[]){
	Scanner scan = new Scanner(System.in);

	int A = scan.nextInt();
	int B = scan.nextInt();
	
	int ans;

	if(A < B){
	    ans = (A - 1) + (B - A - 1);
	}
	else{
	    ans = (2000000000 - A) + (A - B - 1);
	}
	
	System.out.println(ans);

    }


}