var 39 s3 ex3

#include <iostream>
#include <fstream>

using namespace std;


int main() {
    ifstream fin("date.in");
    unsigned int n, x;
    fin >> n;
    int last = -1;
    while(n--) {
        fin >> x;
        if(x%2 == 0) {
            if((int)x >= last) {
                last = x;
            }
            else {
                cout << "NU";
                return 0;
            }
        }
    }
    cout << "DA";
}