#include <iostream>

using namespace std;

int main() {
	int n;

	cout << "Enter an integer: ";

	cin >> n;

	double result = 1.0;
	double multiplier;

	if ( n > 0 ) {
		multiplier = 2.0;
	} else {
		multiplier = 0.5;
		n = -n;
	}

	for ( int i = 1; i <= n; ++i ) {
		result *= multiplier;
	}

	cout << "The result is " << result << endl;

	return 0;
}