#line 1 "main.cpp"
#include <iostream>

using namespace std;

void solve() {
    int n, x;
    cin >> n >> x;

    bool pos = false, neg = false;
    while (n--) {
        int c;
        cin >> c;

        if (c == x) {
            cout << "Yes\n";
            return;
        }
        (c > x ? pos : neg) = true;
    }

    cout << (pos && neg ? "Yes" : "No") << "\n";
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    solve();

    return 0;
}