#include <iostream>
using namespace std;

int main()
{
    int n;
    cin >> n;

    int i = 2;
    int cnt = 0;
    while (n != 1)
    {
        if (n % i == 0)
        {
            n = n / i;
            cnt++;
        }

        else
            i++;
    }

    cout << cnt;

    return 0;
}