#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	int N, X;
	cin >> N >> X;

	vector<int> C(N);
	rep(i, N) cin >> C[i];

	if(N == 1){
		if(X == C[0]){
			cout << "Yes" << endl;
		}else{
			cout << "No" << endl;
		}
	}else{
		if(any_of(C.begin(), C.end(), [&](int x){ return x == X;})){
			cout << "Yes" << endl;
		}else if(
			any_of(C.begin(), C.end(), [&](int x){ return x <= X;})
			&& any_of(C.begin(), C.end(), [&](int x){ return x >= X;})
		){
			cout << "Yes" << endl;
		}else{
			cout << "No" << endl;
		}
	}

}