#include <algorithm>
#include <iostream>
using namespace std;
int main() {
    int n, x; cin >> n >> x;
    int c[n]; for (int i = 0; i < n; i++) cin >> c[i];
    cout << (*min_element(c, c+n) <= x && x <= *max_element(c, c+n) ? "Yes\n" : "No\n");
}