TaskE

// Task04.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;

void primeFactors(int n);
bool isPrime3Factors(int n);

int _tmain(void)
{
    int count = 0;
    int a,b;
        cin >> a >> b;
    for (size_t i = a; i <= b; i++)
    {
        if (isPrime3Factors(i))
            count++;
        ;
    }
    cout << count << endl;
    return 0;
}

bool isPrime3Factors(int n)
{
    int count = 0;
    while (n % 2 == 0)
    {
        if (++count > 3) return false;
        n = n / 2;
    }

    for (int i = 3; i <= sqrt(n); i = i + 2)
    {
        while (n%i == 0)
        {
            if (++count > 3) return false;
            n = n / i;
        }
    }

    if (n > 2) ++count;
    return count == 3;
}