#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() {
	long long N;
	cin >> N;

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

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