#include <bits/stdc++.h>
using namespace std;
int num[1000005];
int com(int a) {
  int z = 1;
  while (z <= a) z <<= 1;
  return z - 1;
}
int main() {
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  memset(num, -1, sizeof(num));
  long long int sum = 0;
  for (int i = n; i >= 0; --i) {
    if (num[i] == -1) {
      num[i] = (com(i) ^ i);
      num[(com(i) ^ i)] = i;
      sum += com(i) * 2;
    }
  }
  cout << sum << endl;
  for (int i = 0; i <= n; ++i) cout << num[i] << ' ';
  cout << endl;
}
