nuj ce

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

int main() {
    int n, x;
    cin >> n >> x;
    int *v = new int[n];
    for (int i = 0; i < n; i++) cin >> v[i];
    sort(v, v + n);
    cout << (binary_search(v, v + n, x) ? "DA" : "NU") << endl;
    return 0;
}