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.
a,b,c = map(int,input().split(" "))
if a >= -c + b:
  print("delicious")
elif a + 1 >= -c + b:
  print("safe")
else:
  print("dangerous")
  
a,b,c = map(int,input().split(" "))
if -b + c <= 0 :
    print("delicious")
elif -b + c <= a:
    print("safe")
else:
    print("dangerous")