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

int main(){
    int n, x; cin >> n >> x;
    vector<int> a(n);
    for(int i = 0; i < n ; i++){
        cin >> a[i];
    }
    int m = *max_element(a.begin(), a.end()), l = *min_element(a.begin(), a.end());
    if(x <= m && x >= l) cout << "Yes" << endl;
    else cout << "No" << endl;
}