#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using lb = long double;
#define fi first
#define se second
#define pb push_back

int main(){
  int n,x;
  cin>>n>>x;
  int mx=0,mi=100;
  for(int i=0;i<n;i++){
    int c;
    cin>>c;
    mx=max(mx,c);
    mi=min(mi,c);
  }
  if(mi<=x&&x<=mx){
    cout<<"Yes"<<endl;
  }
  else{
    cout<<"No"<<endl;
  }
}