#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<cstdio>
#include<string>
#include<algorithm>
#include<cmath>
using namespace std;

#define REP(i,n) for(int i=0;(i)<(n);(i)++)

int main() {
	string s;
	
	cin >> s;

	if (s == "0") {
		cout << 0 << endl;
		return 0;
	}

	cout << s << "0" << endl;
	return 0;
}