Problem:
Score : 100 points

Problem Statement

Takahashi has a strong stomach. He never gets a stomachache from eating something whose "best-by" date is at most X days earlier.
He gets a stomachache if the "best-by" date of the food is X+1 or more days earlier, though.

Other than that, he finds the food delicious if he eats it not later than the "best-by" date. Otherwise, he does not find it delicious.

Takahashi bought some food A days before the "best-by" date, and ate it B days after he bought it.

Write a program that outputs delicious if he found it delicious, safe if he did not found it delicious but did not get a stomachache either, and dangerous if he got a stomachache.

Constraints

1 ≤ X,A,B ≤ 10^9

Input

Input is given from Standard Input in the following format:

X A B

Output

Print delicious if Takahashi found the food delicious; print safe if he neither found it delicious nor got a stomachache; print dangerous if he got a stomachache.

Sample Input 1

4 3 6

Sample Output 1

safe

He ate the food three days after the "best-by" date. It was not delicious or harmful for him.

Sample Input 2

6 5 1

Sample Output 2

delicious

He ate the food by the "best-by" date. It was delicious for him.

Sample Input 3

3 7 12

Sample Output 3

dangerous

He ate the food five days after the "best-by" date. It was harmful for him.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.*;
import java.lang.*;
import java.util.*;
import java.math.*;

class Solver extends Main{
	Solver(){
		
	}
}//Solver_end

@SuppressWarnings("unchecked")
class Main{
	static int imax=Integer.MAX_VALUE;
	static long lmax=Long.MAX_VALUE;
	
	public static void main(String[] args) throws FileNotFoundException{
		
		Scanner sc=new Scanner(System.in);
		int[] num=readlnI(sc," ");
		int eat=num[0]-num[1]+num[2];
		int lmt=num[0]*2;

		if(eat<=num[0]){
			puts("delicious");
		}else if(num[0]<eat && eat<=lmt){
			puts("safe");
		}else if(lmt<eat){
			puts("dangerous");
		}
		
		new Solver();
	}//main_end
	
//---------------------------------------------------------------------------
	static int readI(Scanner sc){
		return Integer.parseInt(sc.nextLine().trim());
	}
	static long readL(Scanner sc){
		return Long.parseLong(sc.nextLine().trim());
	}
	static String readS(Scanner sc){
		return sc.nextLine().trim();
	}
	static int[] readlnI(Scanner sc, String dl){
		return Arrays.stream(sc.nextLine().trim().split(dl)).mapToInt(Integer::parseInt).toArray();
	}
	static long[] readlnL(Scanner sc, String dl){
		return Arrays.stream(sc.nextLine().trim().split(dl)).mapToLong(Long::parseLong).toArray();
	}
	static String[] readlnS(Scanner sc, String dl){
		return sc.nextLine().trim().split(dl);
	}
	@SuppressWarnings("unchecked")
	static <T> void puts(T... args){
		for(int i=0; i<args.length-1; i++){
			System.out.printf("%s ",args[i]);
		}
		System.out.println(args[args.length-1]);
	}
	static void puts(int[] ary){
		for(int i=0; i<ary.length-1; i++){
			System.out.printf("%d ",ary[i]);
		}
		System.out.println(ary[ary.length-1]);
	}
	static void puts(long[] ary){
		for(int i=0; i<ary.length-1; i++){
			System.out.printf("%d ",ary[i]);
		}
		System.out.println(ary[ary.length-1]);
	}
	static void bs(){
		System.out.println("");
	}
	static int sum(int[] ary){
		int sum=0;
		for(int i=0; i<ary.length; i++) sum+=ary[i];
		return sum;
	}
	static long sum(long[] ary){
		long sum=0;
		for(int i=0; i<ary.length; i++) sum+=ary[i];
		return sum;
	}
	static void tblSort(int[][] tbl){
		Arrays.sort(tbl, new Comparator<int[]>(){
			@Override
			public int compare(int[] a, int[] b){
				if(a[0]==b[0]){
					return b[1]-a[1];
				}else{
					return b[0]-a[0];
				}
			}
		});
	}
}