@$\text{JoonHae}$

#include<bits/stdc++.h>
#define hutao long long
using namespace std;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    freopen("chiahet.inp","r",stdin);
    freopen("chiahet.out","w",stdout);
    hutao n;
    cin>>n;
    if(n%4==0)
    {
        cout<<n;
    }
    else if(n%4==1)
    {
        cout<<n+3;
    }
    else if(n%4==2)
    {
        cout<<n+2;
    }
    else
    {
        cout<<n+1;
    }
    return 0;
}