#include <iostream>

using namespace std;

int main()
{
    int n,v[101],i,ant,g=0,ok=1;
    cin>>n;
    for (i=1;i<=n;i++)
        cin >> v[i];

    for (i=1;i<=n;i++)
    {
        if (v[i]%2==0)
        {
            if (g==0)
            {
                ant=v[i];
                g=1;
            }
            else
            {
                if (v[i]<ant)
                {
                    ok=0;
                    break;

                }
            }
            ant=v[i];
        }
    }

    if (ok)
        cout << "DA";
    else
        cout << "NU";
    return 0;
}