#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 = abs(matched - unmatched);
    for (int i = 0; i < min(a, b); i++) {
        matched--;
        unmatched++;
        d = min(d, abs(matched - unmatched));
    }
    cout << d << endl;
}