def extract_arguments(fh):
    N = int(fh.readline().strip())
    lamps = []
    for _ in range(N):
        x, y = map(int, fh.readline().strip().split())
        lamps.append((x, y))
    return N, lamps

# if __name__ == "__main__":
#     input_path = sys.argv[1]
#     with open(input_path, 'r') as fh:
#         N, lamps = extract_arguments(fh)
#         f(N, lamps)