#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  if (n % 2 == 0)
    for (int i = 1; i <= n / 2; i += 1) cout << i << " " << n + 1 - i << " ";
  else {
    for (int i = 1; i < n / 2 + 1; i += 1) cout << i << " " << n + 1 - i << " ";
    cout << n / 2 + 1;
  }
  cout << endl;
}
