#include <bits/stdc++.h>
using namespace std;
const int N = 5e5 + 5;
int ans[N << 1];
int main() {
  int n;
  cin >> n;
  int b1 = n + 1;
  int b2 = 2 * n - 1;
  int a1 = 1;
  int a2 = n;
  int cnt = 1;
  for (int i = 1; i <= n - 1; ++i) {
    if (cnt & 1)
      ans[a1++] = i, ans[a2--] = i;
    else
      ans[b1++] = i, ans[b2--] = i;
    cnt++;
  }
  for (int i = 1; i <= 2 * n; ++i)
    if (ans[i] == 0)
      cout << n << ' ';
    else
      cout << ans[i] << ' ';
}
