import wave
import struct


i = int(input())
source = wave.open("in.wav", mode="rb")
dest = wave.open("out.wav", mode="wb")
frames_count = source.getnframes()

data = struct.unpack("<" + str(frames_count) + "h", source.readframes(frames_count))
newdata = tuple(data[j] for j in range(frames_count) if j % i != i - 1)

newframes = struct.pack("<" + str(len(newdata)) + "h", *newdata)
dest.writeframes(newframes)
source.close()
dest.close()