#include <bits/stdc++.h>
using namespace std;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int a,b;
	cin >> a >> b;
	if(a == 1 && b == 1) {
		cout << 2 << endl;
		return 0;
	}
	cout << max(max(a,b)-min(a,b)-min(a,b)*2,(a+b)%2) << endl;
}