#include <bits/stdc++.h>
    #include <cstring>
    using namespace std;
    typedef long long ll;
    typedef long double ld;
    int main(){
        cin.sync_with_stdio(false);
        cout.sync_with_stdio(false);
        ll n, d;
        ll res=0;
        ll maxdeg=1;
        cin >> n >> d;
        while(true){
            maxdeg<<=1;
            if (maxdeg>d)
                break;
        }
        ll deg=1;
        ll maxdegg=maxdeg;
        maxdeg-=2;
        while(true){
            //cout << maxdeg-deg+1 << endl;
            if((maxdeg-deg+1)<=d && (maxdeg-deg+1)>=n)
                res++;
            if ((maxdeg-deg+1)<n)
                break;
            deg<<=1;
            if (maxdeg-deg+1<=(maxdegg>>1)){
                maxdeg=((maxdeg+2)>>1)-2;
                maxdegg=maxdegg>>1;
                deg=1;
            }
        }
        cout << res;
        return 0;
    }