#include <bits/stdc++.h>
#define rep(i,n) ;for (int i=0; i<(n); i++)
// #include <atcoder/all>
using namespace std;
// using namespace atcoder;
using ll = long long;
using P = pair<int, int>;
 
const ll MOD = 1000000007;
const int INF = 1e9; 
// using Graph = vector<vector<int>>;
 
int main(){
  int N,X;
  cin >> N >> X;
  vector<int> C(N);
  int mi = 100;
  int ma = 0;
  rep(i,N){
    cin >> C[i];
    mi = min(C[i],mi);
    ma = max(C[i],ma);
  }
  if(X<=ma&&mi<=X){
    cout << "Yes" << endl;
  }
  else{
    cout << "No" << endl;
  }
}