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.
X, A, B = map(int, input().split())

if A <= B:
  print("delicious")
elif X + A <= B:
  print("safe")
else:
  print("dangerous")
X, A, B = map(int, input().split())

if A >= B:
  print("delicious")
elif X + A >= B:
  print("safe")
else:
  print("dangerous")