#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a>b) swap(b,a);
	if(b>c) swap(c,b);
	if(c>a) swap(c,a);

	if(b+c<a){
		cout<<"no";
	}else{
	if(c*c+b*b==a*a){
		cout<<"zhijiao";
	}	
			if(c*c+b*b<a*a){
		cout<<"dunjiao";
     }
	if(c*c+b*b>a*a){
		cout<<"ruijiao";
	}
	}

	return 0;
}
/**************************************************************
	Problem: 1018
	User: zhangailin
	Language: C++
	Result: Wrong Answer
****************************************************************/