#include <iostream>
using namespace std;

int main() {
  int n, x;
  cin >> n >> x;
  int c_max = 1, c_min = 99;
  for (int i = 0; i < n; ++i) {
    int c;
    cin >> c;
    if (c > c_max) c_max = c;
    if (c < c_min) c_min = c;
  }
  if (x >= c_min && x <= c_max) {
    puts("Yes");
  } else {
    puts("No");
  }
  return 0;
}