#include<iostream>
using namespace std;
int n,s;
int suma(int k,int v[])
{
    int i,s=0,n=1;
    for(i=1;i<=k;i++,n++)
          if(v[i]==0)
            s-=n;
          else
            s+=n;
      return s;
}
int main()
{
    cin>>n;
    for(int i=1; i<=n; i++)
        s+=i;
    if(s%2==0)
        cout<<15;
    else
    {
        int v[n+1],k;
        k=1;
        v[k]=-1;
        s=2000000000;
        while(k)
        {
            if(k<=n && v[k]<1)
            {
                v[k]++;
                if(k==n)
                {
                    if(suma(k,v)<s && suma(k,v)>=0)
                    {
                        s=suma(k,v);
                    }
                }
                else
                {
                    k++;
                    v[k]=-1;
                }
            }
            else
                k--;
        }
        if(n==1)
        cout<<16;
        else
            cout<<s+15;
    }
    return 0;
}