#include <bits/stdc++.h>
using namespace std;
char arr[1000007];
void sieve() {
  arr[0] = 1;
  arr[1] = 1;
  for (int i = 4; i <= 1000007; i += 2) arr[i] = 1;
  for (int i = 3; i * i <= 1000007; i += 2) {
    if (arr[i] == 0) {
      for (int j = i; i * j <= 1000007; j++) {
        arr[i * j] = 1;
      }
    }
  }
}
int main() {
  sieve();
  int n;
  cin >> n;
  int p = n + 1;
  if (n < 3) {
    if (n == 1) {
      cout << "1" << endl;
      cout << "1" << endl;
      return 0;
    } else {
      cout << "1" << endl;
      cout << "1 1" << endl;
      return 0;
    }
  }
  cout << "2" << endl;
  for (int i = 2; i <= p; i++) {
    if (arr[i] == 0)
      cout << "1 ";
    else
      cout << "2 ";
  }
  cout << endl;
  return 0;
}
