#include <iostream>
#include <sstream>
#include <string>
using namespace std;

string binary(short decimal)
{
	int remainder;
	ostringstream output;

	if (decimal <= 1)
	{
		string s = to_string(decimal);
		return s;
	}

	remainder = decimal % 2;
	output << remainder;
	binary(decimal >> 1);
	return output.str();

}

int main()
{
	short number;
	cout << "Please enter a positive integer.";
	cin >> number;
	if (number < 0)
	{
		cout << "You have entered a negative integer, please enter a positive integer";
		cin >> number;
	}
	else
	{
		cout << binary(number);
	}


	system("PAUSE");
	return 0;
}