#include <fstream>

using namespace std;
ifstream fin("sir11.in");
ofstream fout("sir11.out");
int main()
{
    int n;
    fin>>n;
    while (n!=2){
        if (n%2==0){
            fout<<(-n)/2<<' ';
        }else {
            fout<<(n+1)/2<<' ';
        }
        n--;
    }
    fout<<-1<<' '<<1;
    return 0;
}