package main

import . "fmt"

func main() {
	var a,b int
	Scan(&a,&b)
	if a>b {
		a,b=b,a
	}
	ok:=a*2
	ng:=a+b-ok
	df:=ok-ng
	if df<0 {
		df=-df
	}
	Println(df)
}