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

int main(){
    int n,x;
    cin >> n >> x;
    int ma=1000,mi=0;
    for(int i=0; i<n; i++){
        int c;
        cin >> c;
        ma = max(ma,c);
        mi = min(mi,c);
    }
    if(x < mi || ma < x) cout << "No" << endl;
    else cout << "Yes" << endl;
}