#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
typedef vector<vector<ll>> mat;
const int INF = 1e9;



signed main()
{
    string N;
    
    cin >> N;
    if (N == "0") {
        cout << "0" << endl;
        return 0;
    }

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