#include <iostream>
#include <stdio.h>
#include <vector>
#include <map>
#include <utility>
#include <list>
#include <algorithm>
typedef long long ll;
const ll INF=20000;
using namespace std;

int main(){
    ll n,x;
    cin>>n>>x;
    ll ans=0;
    vector<ll> C(n);
    for(int i=0;i<n;i++)
    {
        cin>>C[i];
    }
    sort(C.begin(),C.end());
    ll right=C[n-1];
    ll left=C[0];
    if(x<=right&&left<=x)cout<<"Yes"<<endl;
    else cout<<"No"<<endl;
    return 0;
}