#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N,X;
  cin>>N>>X;
  vector<int> S(N);
  for(int i=0;i<N;i++) cin>>S[i];
  sort(S.begin(),S.end());
  if(S[0] <= X && X <= S[N-1]) cout<<"Yes"<<endl;
  else cout<<"No"<<endl;
}