#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, char> P;
const int INF = (1<<30);
const ll INFLL = (1ll<<60);
const ll MOD = (ll)(1e9+7);

#define l_ength size

void mul_mod(ll& a, ll b){
	a *= b;
	a %= MOD;
}

void add_mod(ll& a, ll b){
	a = (a<MOD)?a:(a-MOD);
	b = (b<MOD)?b:(b-MOD);
	a += b;
	a = (a<MOD)?a:(a-MOD);
}

ll dp[33][2];

int main(void){
	ll a,b,i,j,x,y;
	dp[32][0] = 1ll;
	cin >> a >> b;
	for(i=31; i>=0; --i){
		for(j=0; j<2; ++j){
			for(x=0; x<2; ++x){
				for(y=0; y<2; ++y){
					if((!j)&&(x>y)){
						continue;
					}
					if(!(((a>>i)&1ll)==(x&y)&&((b>>i)&1ll)==(x|y))){
						continue;
					}
					dp[i][j|(x<y)] += dp[i+1][j];
				}
			}
		}
	}
	cout << (dp[0][0]+dp[0][1]) << endl;
	return 0;
}