#include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "string"
#include "map"
#include "iomanip"
#include "random"

using namespace std;
const long long int MOD = 1000000007;
const long double EPS = 0.0000000001;

long long int N, M, K, Q, W, H, L, R;
long long int ans;

long long int num[200000];


int main() {
	ios::sync_with_stdio(false);
	string s;
	cin >> s;
	if (s == "0")cout << s << endl;
	else cout << s << "0\n";
	return 0;
}