#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;

int main(){
    int A, B; cin >> A >> B;
    int ans = A + B;
    for(int ab=0; ab<=A && ab<=B; ab++){
        int aa = A - ab;
        int bb = B - ab;
        int ba = B - bb;
        if(aa < 0 || bb < 0 || ba < 0) continue;
        ans = min(ans, abs(ab + ba - aa - bb));
    }
    cout << ans << endl;
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;