#include <iostream>

using namespace std;

int main()
{
   int redica;
   int kolona;
   int x;
   int y;

   cin>>redica;
   cin>>kolona;

   cin>>x;
   cin>>y;


   if((x<=redica) and (y<=kolona)and(y>0) and (x>0)){
    cout<<"DA"<<endl;
   }

   if((x>redica) or (y>kolona)or(x<=0)or(y<=0)){
    cout<<"NE"<<endl;
   }


    return 0;
}