#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

int main(){
  int N, X;
  cin >> N >> X;
  vector<int> v(N);
  rep(i,N) cin >> v[i];

  int mn = v[0], mx = v[0];
  rep(i,N){
    mn = min(mn, v[i]);
    mx = max(mx, v[i]);
  }
  
  if(X < mn || mx > X){
    cout << "No" << endl;
  }else{
    cout << "Yes" << endl;
  }
  
  return 0;
}