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

int bliznecbl(int n)
{
	if (n == 1 || n == 0)return 0;
	for (int i = 2; i <= sqrt((double)n); i++)
	{
		if (n % i == 0)return 0;
	}
	return 1;
}

int _tmain(int argc, _TCHAR* argv[])
{
	int n, fl = 0;
	std::cout << "Vvedite n: ";
	std::cin >> n;
	for (int i = n; i < 2 * n; i++)
	{
		for (int j = n + 1; i <= 2 * n; i++)
		{
			if (bliznecbl(i) == 1 && bliznecbl(j) == 1 && abs(i - j) == 2) fl = 1;
		}
	}
	if (fl == 0)std::cout << "Chisel bliznecov net";
	else std::cout << "Chisla blizneci ect'";
	return 0;
}