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  1. #include <bits/stdc++.h>
  2.  
  3. #define forn(i, n) for (int i = 0; i < int(n); i++)
  4. #define ford(i, n) for (int i = int(n) - 1; i >= 0; i--)
  5. #define fore(i, l, r) for (int i = int(l); i < int(r); i++)
  6. #define correct(x, y, n, m) (0 <= (x) && (x) < (n) && 0 <= (y) && (y) < (m))
  7. #define all(a) (a).begin(), (a).end()
  8. #define sz(a) int((a).size())
  9. #define pb(a) push_back(a)
  10. #define mp(x, y) make_pair((x), (y))
  11. #define x first
  12. #define y second
  13.  
  14. using namespace std;
  15.  
  16. typedef long long li;
  17. typedef long double ld;
  18. typedef pair<int, int> pt;
  19.  
  20. template<typename X> inline X abs(const X& a) { return a < 0? -a: a; }
  21. template<typename X> inline X sqr(const X& a) { return a * a; }
  22.  
  23. const int INF = int(1e9);
  24. const li INF64 = li(1e18);
  25. const ld EPS = 1e-9, PI = 3.1415926535897932384626433832795;
  26.  
  27. int n;
  28.  
  29. inline bool read() {
  30.     return !!(cin >> n);
  31. }
  32.  
  33. const int N = 1200300;
  34.  
  35. int ans[N];
  36.  
  37. inline void solve() {
  38.     forn(i, 2 * n) ans[i] = n;
  39.     fore(i, 1, n) {
  40.         int x;
  41.         if (i & 1) x = i >> 1;
  42.         else x = n - 1 + (i >> 1);
  43.         int y = x + (n - i);
  44.         ans[x] = ans[y] = i;
  45.     }
  46.  
  47.     forn(i, 2 * n) {
  48.         if (i) putchar(' ');
  49.         printf("%d", ans[i]);
  50.     }
  51.     puts("");
  52. }
  53.  
  54. int main() {
  55. #ifdef SU1
  56.     assert(freopen("input.txt", "rt", stdin));
  57.     //assert(freopen("output.txt", "wt", stdout));
  58. #endif
  59.    
  60.     cout << setprecision(10) << fixed;
  61.     cerr << setprecision(5) << fixed;
  62.  
  63.     while (read()) {
  64.         solve();
  65.         //break;
  66.     }
  67.    
  68.     return 0;
  69. }
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