#include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for(int i=0; i<(n); i++)
#define REP2(i,x,n) for(int i=x; i<(n); i++)
#define SORT(n) sort((n).begin(),(n).end(),greater<int>())
#define SORTP sort((n).begin(),(n).end(),greater<pair<int,int>>());
#define D(x) for_each((x).begin(),(x).end(),[](auto&& x){cout<<x<<" ";});
#define ALL(n) begin(n),end(n)
#define rALL(n) rbegin(n),rend(n)
#define pb push_back
#define eb emplace_back
using LL=long long;
using ULL=unsigned long long;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
const int INF = numeric_limits<int>::max();
int main()
{
    string S;
    cin >> S;
    cout << ( S == "0" ? "0" : S + "0" ) << endl;
    return 0;
}