#include <iostream>
using namespace std;
int main(void){
    int a, b;
    cin >> a >> b;
    int matched = min(a, b) * 2;
    int unmatched = (a +b ) - matched;
    
    int d = matched - unmatched;
    while (!(d <= 0 || matched == 0)) {
        matched--;
        unmatched++;
        d = matched - unmatched;
    }
    cout << abs(d) << endl;
}