#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <vector>
#include <array>
#include <iomanip>
int main() {
	std::string n;
	std::cin >> n;
	if (n == "0") {
		std::cout << n << std::endl;
	}
	else {
		std::cout << n  << "0" << std::endl;
	}
	return 0;
}