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 b <= a:
  print('delicious')
elif a+b <= a+x:
  pritn('safe')
else:
  print('dangerous')
x, a, b=map(int, input().split())

if a>=b:
  print('delicious')
elif b - a < x + 1:
  print('safe')
else:
  print('dangerous')