#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int N, X, C[100];

int main() {
  cin >> N >> X;
  for (int i = 1; i <= N; i++) cin >> C[i];
  sort(C + 1, C + N + 1);
  if (C[1] <= X && X <= C[N]) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}