#include <iostream>
#include <sstream>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <numeric>
#include <vector>

using namespace std;
#define ll long long
void sherry()
{
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}
int main()
{

    sherry();
    ll n;
    cin >> n;
    ll arr[2]{};
    string s;
    cin >> s;
    for (ll i = 0; i < n; i++)
    {
        arr[s[i] - '0']++;
    }
    ll ones;
    arr[1] % 2 == 0 ? ones = (arr[1] / 2) - 1 : ones = arr[1] / 2;
    if (arr[1] > 0)
        cout << "1";
    for (ll i = 0; i < arr[0]; i++)
    {
        cout << "0";
    }
    for (ll i = 0; i < ones; i++)
    {
        cout << "1";
    }
    return 0;
}