#include<bits/stdc++.h>
using namespace std;
int main()
{
int m, n;
cin >> m >> n;
int arr[m];
for(int i = 0; i < m; i++){
cin >> arr[i];
}
int cnt = 0;
for(int i = 0; i < m; i++){
if(arr[i]==n){
cnt++;
}
}
if(cnt > 0){
cout << "YES" << endl;
}
else {
cout << "NO" << endl;
}
return 0;
}
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