#include "bits/stdc++.h"
using namespace std;
#define int long long
#define endl '\n'
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;

signed main(){
  int a,b;
  cin>>a>>b;
  a--;
  int fb=0;
  if((b+1)/2%2==0)fb^=1;
  if(b%2==0)fb^=b;
  int fa=0;
  if((a+1)/2%2==0)fa^=1;
  if(a%2==0)fa^=a;
  cout<<(fa^fb)<<endl;
}

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