#include<bits/stdc++.h>
using namespace std;

typedef long long LL;
LL a, b;

int cal(string s1, string s2) {
    int len1 = s1.length(), len2 = s2.length();
    int res = 0;

    for(int i = len1 + 1; i <= len2 - 1; i ++)
        res += (i - 1);

    if(len1 != len2) {

        string s3 = "", s4 = "";
        for(int i = 1; i <= len1; i ++) s3 += '1';
        for(int i = 1; i <= len2; i ++) s4 += '1';

        for(int i = 1; i < len1; i ++) {
            string tmp = s3;
            tmp[i] = '0';
            if(tmp >= s1) res ++;
        }

        for(int i = 1; i < len2; i ++) {
            string tmp = s4;
            tmp[i] = '0';
            if(tmp <= s2) res ++;
        }

    } else {
        string s3 = "";
        for(int i = 1; i <= len1; i ++) s3 += '1';
        for(int i = 1; i < len1; i ++) {
            string tmp = s3;
            tmp[i] = '0';
            if(tmp >= s1 && tmp <= s2) res ++;
        }
    }

    return res;
}

void yuri() {
    LL x1 = a, x2 = b;
    string s1 = "", s2 = "";

    while(x1 != 0) {
        char ch = (x1 % 2) + '0';
        s1 += ch;
        x1 /= 2;
    }

    reverse(s1.begin(), s1.end());

    while(x2 != 0) {
        char ch = (x2 % 2) + '0';
        s2 += ch;
        x2 /= 2;
    }

    reverse(s2.begin(), s2.end());

    cout << cal(s1, s2) << '\n';
}

int main() {
    cin >> a >> b;

    yuri();
    return 0;
}