#include <iostream> #include <vector> #include <cmath> #include <map> #include <set> #include <iomanip> #include <queue> #include <algorithm> #include <numeric> #include <deque> #include <complex> #include <cassert> using namespace std; using ll = long long; int main(){ ll A, B, ans=1e5; cin >> A >> B; for (int i=0; i<=min(A, B); i++){ ans = min(ans, abs(B+A-4*i)); } cout << ans << endl; return 0; }