#include <bits/stdc++.h>
using namespace std;
map<pair<int, int>, long long>mp;
long long rec(int n, int m) {
    if (n < 0 || m < 0)
        return 0;
    if (n == 1)
        return m - 1;
    if (m == 1)
        return n - 1;
    long long &ans = mp[{n, m}];
    if (ans != 0)
        return ans;
    if (n >= m) {
        ans += 1 + rec(n / 2, m) + rec((n + 1) / 2, m);
    } else
        ans += 1 + rec(n, m / 2) + rec(n, (m + 1)/ 2);
    return ans;
}
int main() {
    int n , m;
    scanf("%d %d", &n, &m);
    printf("%lld", rec(n , m));
}