#include <bits/stdc++.h>

#define ll long long
#define ul unsigned long long
#define ld long double
#define vll(v) vector<ll>v
//#define vll(v,n) vector<ll>v(n);
#define mll(m) map<ll,ll>m;
#define sll(s) set<ll>s;
#define iv(v) for(auto &i:v) cin >> i;
#define ov(v) for(auto &i:v) cout << i << " ";
#define Bismillah ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);

using namespace std;

void solve() {
    ll a,b;
    cin >> a >> b;
    string aa,bb;

    while (a) {
        if (a%2) aa.push_back('1');
        else aa.push_back('0');
        a/=2;
    }
    while (b) {
        if (b%2) bb.push_back('1');
        else bb.push_back('0');
        b/=2;
    }
    while (aa.back()=='0') aa.pop_back();
    while (aa.back()=='0') aa.pop_back();
    reverse(aa.begin(), aa.end());
    reverse(bb.begin(), bb.end());
    ll ans=0;
    for (int i=0; i<aa.size(); i++) {
        if (aa[i]=='0') {
            for (int j=i+1; j<aa.size(); j++) {
                aa[j]='1';
            }
            while (true) {
                if (aa.size()<bb.size() || aa.size()==bb.size() && aa<=bb) ans++;
                for (int l=i+1; l<aa.size(); l++) {
                    aa[l-1]='1';
                    aa[l]='0';
                    if (aa.size()<bb.size() || aa.size()==bb.size() && aa<=bb) ans++;
                    else {
                        cout << ans << endl;
                        return;
                    }
                }
                aa.back()='1';
                aa.push_back('1');
                aa[1]='0';
                i=0;
            }
        }
    }
}

int main() {
    Bismillah
    ll t=1;
//    cin >> t;
    while (t--) {
        solve();
    }
    return 0;
}