#include <bits/stdc++.h>

using u32 = unsigned;
using i64 = long long;
using u64 = unsigned long long;

constexpr int P = 1E9 + 7;

int g(i64 X) {
	int i = 0;
	while (X > 1) {
		if (X % 2) X++;
		else X /= 2;
		++i;
	}
	return i;
}
i64 f(i64 X) {
	if (X <= 1) return 0;
	return ((X - 1) / 2 % P + (X - 1) % P + 2 * f((X + 1) / 2) % P - (X & 1 ? g((X + 1) / 2) : 0)) % P;
}

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

	i64 l, r;
	std::cin >> l >> r;

	std::cout << (i64)(((f(r) - f(l - 1)) % P + P) % P) << "\n";

	return 0;
}