#include <cmath>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
	int H, W;
	cin >> H >> W;
	int startline = max(W - H, 0);
	long long ans = abs(H - W) + 1;
	for (int i = 0; i < 30; ++i) {
		int l = max(startline, 1 << i), r = min(W, 2 << i);
		if (l < r) ans += 1LL * (r - l) * (i + 2);
	}
	cout << ans << endl;
	return 0;
}