#include <bits/stdc++.h>
using namespace std;
long long arr[200005], pos[200005];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  ;
  long long n;
  cin >> n;
  cout << n << " ";
  if (n == 1) {
    cout << "1";
    return 0;
  }
  if (n % 2) {
    long long tmp = 1;
    while (tmp < n) {
      cout << tmp << " ";
      tmp += 2;
    }
    cout << n << " ";
    while (tmp > 1) {
      cout << tmp - 2 << " ";
      tmp -= 2;
    }
    tmp = 2;
    while (tmp < n - 1) {
      cout << tmp << " ";
      tmp += 2;
    }
    cout << n - 1 << " " << n - 1 << " ";
    while (tmp > 2) {
      cout << tmp - 2 << " ";
      tmp -= 2;
    }
  } else {
    long long tmp = 2;
    while (tmp < n) {
      cout << tmp << " ";
      tmp += 2;
    }
    cout << n << " ";
    while (tmp > 2) {
      cout << tmp - 2 << " ";
      tmp -= 2;
    }
    tmp = 1;
    while (tmp < n - 1) {
      cout << tmp << " ";
      tmp += 2;
    }
    cout << n - 1 << " " << n - 1 << " ";
    while (tmp > 1) {
      cout << tmp - 2 << " ";
      tmp -= 2;
    }
  }
  return 0;
}
