/* -*- coding: utf-8 -*-
 *
 * 1395.cc:  No.1395 Less Sweet Alchemy - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int n, x;
  scanf("%d%d", &n, &x);

  int minc = 100, maxc = 0;
  for (int i = 0; i < n; i++) {
    int ci;
    scanf("%d", &ci);
    if (minc > ci) minc = ci;
    if (maxc < ci) maxc = ci;
  }

  if (minc <= x && x <= maxc) puts("Yes");
  else puts("No");
  return 0;
}