#include <bits/stdc++.h>
using namespace std;

int main()
{
	int N, X;
	cin >> N >> X;
	int e = 0;
	int b = 0;
	int s = 0;
	for( int i = 0; i < N; i++ ) {
		int C;
		cin >> C;
		if( C == X ) e = 1;
		else if( C > X ) b = 1;
		else if( C < X ) s = 1;
	}

	string ans = "No";
	if( e || (b && s) ) ans = "Yes";

	cout << ans << endl;
}