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)

/*
 * 高橋君は胃が強いので、賞味期限を X 日まで過ぎた食品を食べてもお腹を壊しません。 賞味期限を X+1 日以上過ぎた食品を食べると、お腹を壊します。
 * 
 * また、賞味期限を過ぎずに食べると、おいしく感じます。そうでない場合、おいしく感じません。
 * 
 * 高橋君は、賞味期限の A 日前に食品を買ってきて、買ってから B 日後に食べました。
 * 
 * 高橋君が食品をおいしく感じた場合 delicious を、おいしくは感じなかったがお腹は壊さなかった場合 safe を、お腹を壊した場合 dangerous を出力するプログラムを作成してください。
 */

import java.util.*;
	public class Main{
        public static void main(String[] args){
            Scanner sc = new Scanner(System.in);
            //入力
            int x = Integer.parseInt(sc.next());
            int a = Integer.parseInt(sc.next());
            int b = Integer.parseInt(sc.next());
            
            //出力
            if(a>=b){
            	System.out.println("delicious");
            }else if(a+x>=b){
            	System.out.println("safe");
            }else{
            	System.out.println("dangerous");
            }  
            sc.close();
        }
    }