#include <iostream>
using namespace std;
int main()
{
int n, a, b, crescator=1, i, p=-1;
cin >> n;
i=0;
while (i<n)
{
++i;
cin >> a;
if (a%2==0) {
if (p==-1) p=a;
else {b=a;
if (b<=p) crescator=0;
p=a;}
}
}
if (crescator) cout << "DA";
else cout << "NU";
return 0;
}