#include <bits/stdc++.h>
using namespace std;

#define xx first
#define yy second
#define long long long 
typedef pair<int, int> ii;

map<ii, long> cnt;

long process(int a, int b) {
    // if (b == 0 or a == 0) return 0;
    if (a == 1 and b == 1) return 0;
    if (cnt.count(ii(a, b))) return cnt[ii(a, b)];
    if (a == 1) cnt[ii(a, b)] = process(a, b / 2) + process(a, b - b / 2) + 1;
    else if (b == 1) cnt[ii(a, b)] = process(a / 2, b) + process(a - a / 2, b) + 1;
    else cnt[ii(a, b)] = (1 + min(
        process(a, b - b / 2) + process(a, b / 2),
        process(a - a / 2, b) + process(a / 2, b)
    ));
    return cnt[ii(a, b)];
}

int main() {
    int a, b; cin >> a >> b;
    cout << process(a, b);
    
    return 0;
}