#include<bits/stdc++.h>
using namespace std;
int main(){
   int n,x,s;
   cin>>n>>x>>s;
   if(n>x) swap(x,n);
   if(n>s) swap(s,n);
   if(x>s) swap(s,x);
   
   if(n+x>s) {
   	if(n*n+x*x==s*s) cout<<"zhijiao";
   else if(n*n+x*x>s*s) cout<<"ruijiao";
   	
   else if(n*n+x*x<s*s) cout<<"dunjiao";
   	
   
   }
   else cout<<"no";
   
	return 0;
}

/**************************************************************
	Problem: 1018
	User: duyahan
	Language: C++
	Result: Accepted
	Time:17 ms
	Memory:2072 kb
****************************************************************/