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

int main(){
    ll N,X;cin>>N>>X;
    ll ct = 0;
    ll ct2 = 100;
    for(ll i=0;i<N;i++){
        ll C;cin>>C;
        ct = max(ct,C);
        ct2 = min(ct2,C);
    }
    if(X>=ct2&&X<=ct){
        cout<<"Yes"<<endl;
        return 0;
    }else if(X==ct||X==ct2){
         cout<<"Yes"<<endl;
         return 0;
    }else{
        cout<<"No"<<endl;
    }
}