#include <bits/stdc++.h>
using namespace std;
int nnode, root, vis[1000005];
int32_t main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  int n;
  while (cin >> n) {
    long long ans = 0;
    memset(vis, -1, sizeof vis);
    for (int i = n; i >= 0; i--) {
      int a = 0;
      int f = 0;
      if (vis[i] != -1) continue;
      for (int j = 26; j >= 0; j--) {
        f |= ((bool)(i & (1 << j)));
        if (f) {
          int b = ((bool)(i & (1 << j)));
          if (!b) a |= (1 << j);
        }
      }
      ans += 2 * (a ^ i);
      vis[a] = i;
      vis[i] = a;
    }
    cout << ans << endl;
    for (int i = 0; i <= n; i++) cout << vis[i] << " ";
    cout << endl;
  }
  return 0;
}
