#include<iostream>
using namespace std;

int main(){
	float DTB;
	cout<<"Diem trung binh la:";
	cin>>DTB;
	if(DTB<5) cout<<"KHONG DAT";
	else if(DTB>=5) cout<<"DAT";
	else if(DTB>=6.5 && DTB<= 7.9) cout<<"KHA";
	else cout<<" GIOI";
	return 0;
}