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

int main() {
int64_t a, b;
cin >> a >> b;
int c;
if (a > b) {
if ((3 * b) > a) {
c = (a + b) - (a + b) / 2 * 2;
cout << c << endl;
}
else {
c = a - 3 * b;
cout << c << endl;
}
}
else {
if ((3* a )> b) {
c = (a + b) - (a + b) / 2 * 2;
cout << c << endl;
}
else {
c = b - 3 * a;
cout << c << endl;
}
}
}