def day13_1():
    with open("input.txt", "r") as file:
        data = file.readlines()

    timestamp = int(data[0])
    buses = [int(i) for i in data[1].split(",") if i != "x"]
    next_stop = [b - timestamp % b for b in buses]

    return min(next_stop) * buses[next_stop.index(min(next_stop))]