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

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