#include <bits/stdc++.h>
using namespace std;
template <class T1>
void debug(T1 e) {
  cout << e << endl;
}
template <class T1, class T2>
void debug(T1 e1, T2 e2) {
  cout << e1 << "\t" << e2 << endl;
}
template <class T1, class T2, class T3>
void debug(T1 e1, T2 e2, T3 e3) {
  cout << e1 << "\t" << e2 << "\t" << e3 << endl;
}
template <class T1, class T2, class T3, class T4>
void debug(T1 e1, T2 e2, T3 e3, T4 e4) {
  cout << e1 << "\t" << e2 << "\t" << e3 << "\t" << e4 << endl;
}
template <class T1, class T2, class T3, class T4, class T5>
void debug(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5) {
  cout << e1 << "\t" << e2 << "\t" << e3 << "\t" << e4 << "\t" << e5 << endl;
}
template <class T1, class T2, class T3, class T4, class T5, class T6>
void debug(T1 e1, T2 e2, T3 e3, T4 e4, T5 e5, T6 e6) {
  cout << e1 << "\t" << e2 << "\t" << e3 << "\t" << e4 << "\t" << e5 << "\t"
       << e6 << endl;
}
template <class T>
void debug(vector<vector<T> > e, int row, int col) {
  int i, j;
  for (i = 0; i < row; i++) {
    for (j = 0; j < col; j++) cout << e[i][j] << " ";
    cout << endl;
  }
  cout << endl;
}
template <class T>
void debug(vector<basic_string<T> > e, int row, int col) {
  int i, j;
  for (i = 0; i < row; i++) {
    for (j = 0; j < col; j++) cout << e[i][j];
    cout << endl;
  }
  cout << endl;
}
template <class T>
void debug(T e[110][110], int row, int col) {
  int i, j;
  for (i = 0; i < row; i++) {
    for (j = 0; j < col; j++) cout << e[i][j] << " ";
    cout << endl;
  }
}
template <class T>
string toString(T n) {
  ostringstream oss;
  oss << n;
  oss.flush();
  return oss.str();
}
int toInt(string s) {
  int r = 0;
  istringstream sin(s);
  sin >> r;
  return r;
}
bool isVowel(char ch) {
  ch = tolower(ch);
  if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
    return true;
  return false;
}
bool isUpper(char c) { return c >= 'A' && c <= 'Z'; }
bool isLower(char c) { return c >= 'a' && c <= 'z'; }
long long sum;
long long arr[1000100];
long long n;
int main() {
  while (cin >> n) {
    sum = 0;
    memset(arr, 0, sizeof(arr));
    long long i;
    long long N = n;
    while (n > 0) {
      long long j = 1;
      for (i = n; __builtin_popcount(i) != 1; i--, j++)
        ;
      long long in = i - 1;
      for (; j; i++, j--, in--) {
        arr[i] = in;
        arr[in] = i;
      }
      n = in;
    }
    for (i = 0; i <= N; i++) sum += (i ^ arr[i]);
    cout << sum << endl;
    cout << arr[0];
    for (i = 1; i <= N; i++) cout << " " << arr[i];
    cout << endl;
  }
  return 0;
}
