#include <iostream>
#include <stack>
#include <fstream>
#include <cmath>


using namespace std;
ifstream in("input.txt");
ofstream out("output.txt");

int main() {
  setlocale(LC_ALL,"rus");
  stack <int> first;

  int k;
  int l;
  int a;
  int b;

  in >> l;
  in >> k;
  k = k-1;
  b = k;

  int i = 0;
  if (l = ' ')
      return 0;

  if (k> l/2)
      b = (k-(l-(l/2+l%2))*-1);


  while (i != l/2)
  {
    in >> a;
    first.push(a);
    if (b == i)
        first.push(0);
      out << first.top();
    i++;
  }



 k = (l/2+ l%2) - k -1;
 i = 0;
  while (i != (l/2 + l%2))
     {
     in >> a;
        first.push(a);
     a = l;
     if (k == i)
        first.push(0);
     out << first.top();
     i++;
     }
  return 0;
}