#!/usr/bin/python3

import sys

filename=(len(sys.argv) > 1) and sys.argv[1] or "22_10.txt"

adaptors=[int(line.rstrip()) for line in open(filename, "r")]
adaptors.sort()
end_jolts=adaptors[-1]+3

adaptors.insert(0, 0)
adaptors.append(end_jolts)

cur_configs=1

def get_choices():
    choice_count=1
    can_reach={}
    paths={0:1}
    for adaptor in adaptors:
        can_reach[adaptor]=[a for a in adaptors if (a >= adaptor+1 and a <= adaptor+3)]

    for adaptor in adaptors:
        for adaptor2 in can_reach[adaptor]:
            if adaptor2 not in paths:
                paths[adaptor2]=0
            paths[adaptor2]+=paths[adaptor]

    return paths[adaptors[-1]]

total = get_choices()

print("Maybe possibly all the configs")
print(total)