#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using namespace std;


int main()
{
    int n, x;
    cin >> n >> x;
    vector<int> c(n);
    for (int i = 0; i < n; i++) cin >> c[i];
    sort(c.begin(), c.end());
    cout << ((c[0]<=x && c[n-1] >= x) ? "Yes" : "No") << endl;
}