//#include<bits/stdc++.h>
#include<iostream>
#include<cstdio>
#include<string>
#include<cstring>
#include<cmath>
#include<vector>
#include<iomanip>
#include<algorithm>
using namespace std;

int main(){
    int a;
    cin>>a;
    int ans=1;
    for(int i=2;i<=a;++i)ans^=i;cout<<ans;
    return 0;
}