#include<bits/stdc++.h>
using namespace std;
int main(){
    int x,y,z,n;
	cin>>x>>y>>z;
	n=x+y+z/3;
	if(x>=90&&y>=90&&z>=90){
		cout<<"beijing";
	}else if(x>=90||y>=90&&z>=90){
		cout<<"xiamen";
	}else if(x>=90||y>=90||z>=90){
		cout<<"guilin";
	}else if(x>=85||y>=85||z>=85){
		cout<<"shanghai";
	}else{
		cout<<"nanjing";
	}
}

/**************************************************************
	Problem: 1679
	User: yangjunwen
	Language: C++
	Result: Wrong Answer
****************************************************************/