#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  int n;
  cin >> n;
  int st = 1, en = n;
  while (st < en) cout << st++ << " " << en-- << " ";
  if (st == en) cout << st;
  return 0;
}
