#include <iostream>

using namespace std;

bool IsGood(uint64_t num) {
    char last_digit = '0' + (num % 2);
    num /= 2;
    int cnt = 1;
    while (num > 0)
    {
        char digit = '0' + (num % 2);
        num /= 2;

        if (last_digit != digit) {
            cnt++;
            last_digit = digit;
        }
        if (cnt > 3) {
            return false;
        }
    }

    return cnt == 3;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    uint64_t from;
    uint64_t to;
    cin >> from >> to;

    uint64_t grow_days_cnt = 0;

    while (from <= to) {
        if (IsGood(from)) {
            ++grow_days_cnt;
        }
        ++from;
    }

    cout << grow_days_cnt;

    return 0;
}