#include <iostream>
#include <vector>
#include <string>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)
#define dump(s) cerr << __LINE__ << "\t:" << #s << " = " << (s) << endl
    
using namespace std;

int main () {
    string s;
    cin >> s;
    if (s != "0") {
	cout << s << '0' << endl;	
    }
    else {
	cout << 0 << endl;
    }
    
    return 0; 
}