#include<bits/stdc++.h>
// #include<atcoder/all>

using namespace std;
// using namespace atcoder;
using ll = long long;
using ull = unsigned long long;
using P = pair<int,int>;
#define rep(i,n) for(ll i = 0;i < (ll)n;i++)
#define ALL(x) (x).begin(),(x).end()
#define MOD 1000000007



int main(){
  
  int n,x;
  cin >> n >> x;
  int mn = MOD,mx = -MOD;
  rep(i,n){
    int a;cin >> a;
    mn = min(mn,a);
    mx = max(mx,a);
  }
  cout << (mn <= x && mx >= x ? "Yes\n" : "No\n");
  

  return 0;
}