package main

import (
	"fmt"
)

var (
	A int
	B int
)

const (
	Min = 1
	Max = 2 * 1e9
)

func resolve() int {
	ret := 0
	if B > A {
		ret += B - A - 1
		ret += A - Min
	} else {
		ret += Max - A
		ret += A - B - 1
	}
	return ret
}

func main() {
	fmt.Scanf("%d %d\n", &A, &B)
	fmt.Println(resolve())
}