#include <iostream>
#include <cassert>
#include <vector>

using namespace std;

int f(long long x, const vector<long long> &primes) {
  int ret = 0;
  for (long long i: primes) {
    while (x % i == 0) {
      ret++;
      x /= i;
    }
  }
  if (x > 1) ret++;
  return ret;
}

int main() {
  long long M; cin >> M;
  int N = 1e5 + 1;
  vector<long long> primes;
  vector<bool> is_prime(N, true);
  is_prime[0] = false;
  is_prime[1] = false;
  for (int i = 2; i <= N; i++) {
    if (is_prime[i]) {
      primes.push_back((long long)i);
      for (int j = i + i; j <= N; j += i) {
	is_prime[j] = false;
      }
    }
  }

  int ret = 0;
  for (int i = 0; i < N && M >= primes[i] ; i++) {
    M /= primes[i];
    ret++;
  }
  cout << ret << endl;
  return 0;
}