#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using ll = long long;
using namespace std;


int main()
{
    ll a, b, nat, unat;
    cin >> a >> b;
    nat = min(a, b);
    unat = abs(a - b);
    cout << (((nat*2 - unat) >= 0) ? (unat%2) : unat - nat*2) << endl;
}