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<x:
    print('delicious')
else:
    print('dangerous')
x,a,b=map(int,input().split())
if b-a<=x:
    if b-a<=0:
        print('delicious')
    else:
        print('safe')
else:
    print('dangerous')