with open(r"C:\Users\Maya\Desktop\Uni\WS_2021\AoC\input01") as f:
    lines = f.readlines()

    # make ints out of strings
    numbers = ([0] * (len(lines) + 1))
    for n in range(0, len(lines)):
        numbers[n] = int(lines[n])

    # challenge 1
    for i in range(0, len(numbers)):
        for j in range(i + 1, len(numbers)):
            if numbers[i] + numbers[j] == 2020:
                print(numbers[i] * numbers[j])

    # challenge 2
    for i in range(0, len(numbers)):
        for j in range(i+1, len(numbers)):
            for k in range(j+1, len(numbers)):
                if numbers[i] + numbers[j] + numbers[k] == 2020:
                    print(numbers[i] * numbers[j] * numbers[k])