#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second

const ll MOD = 1000000007;
const ll MOD2 = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;

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

    ll a, b; cin >> a >> b;
    ll unn = a + b;
    ll n = 0;
    ll ans = a + b;
    for(ll i=0; i<min(a, b); i++){
        unn -=2;
        n += 2;
        ans = min(ans, abs(unn-n));
    }

    cout << ans << endl;
}