package main

import (
	"fmt"
)

func getRook (gx int, gy int) int {
	if (gx == 0 || gy == 0) {return 1}
	return 2
}

func getBishop (gx int, gy int) int {
	if ((gx + gy) % 2 != 0) {return 999}
	if (gx == 0 && gy == 0) {return 0}
	if (abs(gx) == abs(gy)) {return 1}
	return 2
}

func abs(x int) int{
	if(x < 0) {return -x}
	return x
}

func main(){
	var gx, gy int
	fmt.Scan(&gx, &gy)

	rook := getRook(gx,gy)
	bishop := getBishop(gx,gy)

	ans := rook
	if(bishop < ans) {ans = bishop}

	fmt.Println(ans)

}