#include <bits/stdc++.h> 
using namespace std; //型に気を付けよう //a=0x61=97 '0'=0x30=4
#define rep(i,n) for(int i=0;i<n;i++)
typedef long long  ll;
typedef long double  ld; 
typedef string str;
typedef pair<int,int> pairii; 
typedef vector<int> veci; const double pi=3.1415926535;
const ll  mod=1000000007; //桁数指定　cout << fixed << setprecision(2) 
int main() {   int n,k;cin>>n>>k; veci v(n); rep(i,n){cin>>v[i];} sort(v.begin(),v.end()); if(v[0]<=k&&k<=v[n-1])cout<<"Yes"<<endl; else cout<<"No"<<endl; }