#include <bits/stdc++.h>

using namespace std;

int N, K, A[200000];

int main() {
  cin >> N >> K;
  assert(N % 2 == 0);
  assert(2 <= N && N <= 200000);
  assert(1 <= K && K <= 1000000000);
  for(int i = 0; i < N; i++) {
    cin >> A[i];
    assert(1 <= A[i] && A[i] <= 1000000000);
  }
}