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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

# include <iostream>
# include <sstream>
# include <cstdio>
# include <cstdlib>
# include <algorithm>
# include <string>
# include <cstring>
# include <cmath>
# include <stack>
# include <queue>
# include <vector>
# include <list>
# include <map>
# include <set>
# include <deque>
# include <iterator>
# include <functional>
# include <bitset>
# include <climits>
# include <ctime>
#define max(a,b) ((a)>(b)?(a):(b))
#define min(a,b) ((a)<(b)?(a):(b))
#define odd(x) ((x)%2)
typedef long long ll;
typedef long double ld;
const ll oo=2*1000*1000*1000;
const int _cnt=1000*1000;
const int _p=1000*1000*1000+7;
int o(int x) { return x%_p; }
int gcd(int a,int b) { return b?gcd(b,a%b):a; }
int lcm(int a,int b) { return a/gcd(a,b)*b; }
using namespace std;

void file_put(){
	freopen("filename.in","r",stdin);
	freopen("filename.out","w",stdout);
}

int a,b,x; 

int main(){
	//file_put();
	
	scanf("%d%d%d",&x,&a,&b);
	if (b-a<=0) return 0*printf("delicious\n");
	if (b-a>x) return 0*printf("dangerous\n");
	printf("safe\n");
  
	return 0;
}