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

class Main {
	
	static int len;
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static int solve (int a , int b) {
		int ret = Math.abs(a - b) - 1;
		return a < b ? ret + a - 1 : ret + 2000000000 - a;
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		String[] line = br.readLine().split(" ");
		int a = Integer.parseInt(line[0]);
		int b = Integer.parseInt(line[1]);
		
		out(solve(a , b));
	}
}