#include <bits/stdc++.h> 
using namespace std;
using ll =long long;
#define all(v) v.begin(),v.end()
 #define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)

int main() {
    ll A,B;cin>>A>>B;
    if(A<=B) swap(A,B);


    if(2*B<=A-B) {
      cout<<A-3*B<<endl;
    }
    else {
     ll k=3*B-A;
    k%=4;

    cout<<min(k,4-k)<<endl;
    
    }
}