#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
static const double EPS = 1e-12;
static const double PI = acos(-1.0);

template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;

#define FOR(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define ALL(a) (a).begin(), (a).end()
#ifdef LOCAL
#define dbg(x) cerr << __LINE__ << " : " << #x << " = " << (x) << endl
#else
#define dbg(x) true
#endif

int main() {
  int n, x;
  cin >> n >> x;
  vector<ll> c(n);
  REP(i, n) {
    cin >> c[i];
  }
  sort(ALL(c));
  cout << ((c[0] <= x && x <= c[n - 1]) ? "Yes" : "No") << endl;
  return 0;
}