#include <iostream>
#include <cmath>

using namespace std;

int main(int argc, char *argv[])
{
	int N;

	cout << "Input the # of bits - ";
	cin >> N;

//	if (argc > 1)
//	{
//		N = atoi(argv[1]);
		cout << "There are " << pow(2.0, N) << " binary numbers.\n\n";
//	}
//	else
		cout << "Need the number of N.\n";

	return 0;
}