# Pastebin Vkn7krhb
x = scandir(ben_dir)
folders = [folder.name for folder in x if folder.is_dir()]
prefix_num = [int(dir_string[:3]) for dir_string in folders]
# print(prefix_num)
# print(max(prefix_num))
inc_prefix = '{:03d}'.format(max(prefix_num) + 1)
print(inc_prefix)