#include <bits/stdc++.h>
using namespace std;
int arr[1000005];
bool visi[1000005];
int main() {
  int i, j, tst, cas = 1, n;
  int a, cnt = 0;
  scanf("%d", &n);
  a = n;
  while (a) {
    cnt++;
    a >>= 1;
  }
  long long ans = 0;
  while (cnt >= 0) {
    long long pres = 1 << cnt;
    pres--;
    for (i = n; i >= 0; i--) {
      if (visi[i]) {
        continue;
      }
      int now = pres ^ i;
      if (now > n) {
        continue;
      }
      if (visi[now]) {
        continue;
      } else {
        visi[now] = 1;
        visi[i] = 1;
        arr[now] = i;
        arr[i] = now;
        ans += pres * 2;
      }
    }
    cnt--;
  }
  cout << ans << endl << arr[0];
  for (i = 1; i <= n; i++) {
    printf(" %d", arr[i]);
  }
  putchar(10);
  return 0;
}
