#include <iostream>
#include <cstring>

using namespace std;

int main () {
   int n;

   cin >> n;

   int arr[n];

   for (int i = 0; i < n; i ++) {
        cin >> arr[i];
   }

    arr[0]  = 1;

   for (int i = 1; i < n; i ++) {
        arr[i] = 1;
   }

   for (int i = 0; i < n; i ++) {
    cout << arr[i];
   }


   return 0;
}
