#danglam228

#include <bits/stdc++.h>
using namespace std;
int n, k;
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    //freopen(".INP","r",stdin);
    //freopen(".OUT","w",stdout);
    cin >> n >> k;
    bool check = false;
    for (int i = 0; i < n; ++i) {
        int a;
        cin >> a;
        if (a == k) {
            check = true;
            break;
        }
    }
    if (check) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }

    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int a[1000005], n, k;
bool check(int a[], int n, int x)
{
    int l=1,r=n;
    while(l<=r)
    {
        int mid=(l+r)/2;
        if(a[mid]==x) return true;
        if(a[mid]>x)r=mid-1;
        else l=mid+1;
    }
    return false;
}
int main()
{
    cin>>n>>k;
    for(int i=1;i<=n;++i)
    {
        cin>>a[i];
    }
    sort(a+1,a+1+n);
    if(check(a,n,k)) cout<<"YES";
    else cout<<"NO";
    return 0;
}