#include <bits/stdc++.h>
using namespace std;
int table[1 << 20] = {0};
int answer[1 << 20] = {0};
int main() {
  ios_base::sync_with_stdio(false);
  long long n;
  cin >> n;
  int m = ++n;
  for (int i = 0; i < n; ++i) {
    table[i] = i;
  }
  int *ptr = answer;
  while (m != 0) {
    int msb = 0;
    while ((m >> (msb + 1)) > 0) {
      ++msb;
    }
    int k = m - (1 << msb);
    for (int i = 0; i < (1 << msb) - k; ++i) {
      ptr[i] = ((1 << msb) - 1) & ~i;
    }
    for (int i = (1 << msb) - k; i < (1 << msb); ++i) {
      ptr[i] = (1 << msb) | (((1 << msb) - 1) & ~i);
    }
    m ^= (1 << msb);
    ptr += (1 << msb);
  }
  long long sum = 0;
  for (int i = 0; i < n; ++i) {
    sum += i ^ answer[i];
  }
  cout << sum << endl;
  for (int i = 0; i < n; ++i) {
    if (i != 0) {
      cout << " ";
    }
    cout << answer[i];
  }
  cout << endl;
  return 0;
}
