#include <iostream>
using namespace std;
int main(){
    int n,k;cin>>n>>k;
    int mn = 101;
    int mx = -1;
    for(int i = 0; n > i; i++){
        int t;cin>>t;
        mn = min(mn,t);
        mx = max(mx,t);
    }
    if(mn <= k && k <= mx){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }
}