#include <iostream>
using namespace std;
int main()
{
int S,D,R,M,Max=2e9;
cin>>S>>D>>R>>M;
if(S-D>=0 && Max>=S-D) Max=S-D;
if(S-R>=0 && Max>=S-R) Max=S-R;
if(S-M>=0 && Max>=S-M) Max=S-M;
if(Max==2e9) cout<<"nimic";
else if(Max==S-D) cout<<"drona";
else if(Max==S-R) cout<<"robot";
else cout<<"masina";
return 0;
}