#include <bits/stdc++.h>
using namespace std;
int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);  
	int x, y;
	cin >> x >> y;
	long long ans = 0;
	for(int i = x; i <= y; i++) {
		if(i & 1 && i % 4 != 1) continue;
		if(i & 1 == 0 && i % 4 != 2) continue;
		long long tmp = 0;
		for(int j = 1; j * j <= i; j++) {
			if(i % j) continue;
			int k = i / j;
			if(j % 4 == 1) tmp++;
			if(j % 3 == 0) tmp--;
			if(k == j) continue;
			if(k % 4 == 1) tmp++;
			if(k % 3 == 0) tmp--;
		}
		ans = max(4 * tmp, ans);
	}
	cout << ans << endl;
	return 0;
}