def part1():
    file = open("input.txt")
    lines = [int(i) for i in file.readlines()]

    lines = sorted(lines)

    diffs = {1: 0, 3: 0}

    diffs[lines[0]] += 1
    lines.append(max(lines) + 3)

    for i in range(1, len(lines)):
        diff = lines[i] - lines[i - 1]
        diffs[diff] += 1

    print("Part 1 %d " % (diffs[1] * diffs[3]))


def part2():
    file = open("input.txt")
    lines = [int(i) for i in file.readlines()]


if __name__ == "__main__":
    part1()
    part2()