#include <bits/stdc++.h>
#define int long long
#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)
#define SP << " " <<
#define fish signed
using namespace std;
mt19937 rnd(1209);
const int INF = 0x3f3f3f3f3f3f3f3f, mod = 1e9 + 7;
int f(int x)
{
    int cnt = 0;
    while(x != 1)
    {
        if(x % 2 == 0) x = x / 2;
        else x = x + 1; cnt ++;
    } return cnt;
}
int calc(int x)
{
    if(x == 1 || !x) return 0;
    if(x & 1) return (calc(x - 1) + f(x)) % mod;
    return (((x / 2) % mod + (x / 2) % mod * 2 % mod + calc(x / 2) * 2 % mod - 2) % mod + mod) % mod;
}
fish main()
{
    // freopen(".in", "r", stdin);
    // freopen(".out", "w", stdout);
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int l, r; cin >> l >> r;
    cout << ((calc(r) - calc(l - 1)) % mod + mod) % mod;
    return 0;
}