"use strict";
const rl=require("readline").createInterface(process.stdin);

const g=function*(){
	let [A,B]=(yield rl.once("line",s=>g.next(s))).split(/ /).map(s=>parseInt(s,10));
	let max=A<B?B:A;
	let cnt=0;
	for(let Y=0;Y<=max;Y++){
		for(let X=0;X<=Y;X++){
			if((X&Y)==A && (X|Y)==B){
				cnt++;
				break;
			}
		}
	}
	console.log(cnt);
	rl.close();
}();
g.next();