#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second

using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
ll k;
ll Fe(int x){
	if(x==1)
		return k;		
	if(x%2==0)
		return Fe(x/2)*2+1;
	else
		return Fe(x/2)+Fe(x/2+1)+1;
}
int main(){
	ll a,b;
	cin>>a>>b;
	k=Fe(a);
	cout<<Fe(b)<<endl;
	return 0;
}