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README.md

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+# golfathon
+
+Welcome to our code golf hackathon! You can either create new hackathon problems or answer existing ones. Have fun!
+
+## Create
+
+To create a new problem, make a folder named after the problem and write the problem statement in the `README.md` inside the folder. See `pund/README.md` for an example.
+
+## Answer
+
+Write your answer to a problem in the a file named using your username in the problem's folder. Preferably, your program should run in a reasonable amount of time and not access the internet.

pund/README.md

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+# pund
+
+Define *pund numbers* as positive integers that look the same when rotated 180 degrees. 212 and 6699 are pund numbers while 17071 is not. More specifically 0, 1, 2, 5, and 8 are defined to be unchanged by a 180 degree rotation, while 6 after the rotation becomes a 9 and vice versa.
+
+Your task is to write a program that takes in a positive integer `k` as an input and outputs the `k`th pund number.

pund/a.py

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+import sys
+c=int(sys.argv[1])
+i=0
+while c:
+ i+=1
+ c-=list(str(i))[::-1]==list(map(lambda j:'012xx59x86'[ord(j)-48],str(i)))
+print(i)