def get_start_activities_threshold(salist, decreasing_factor):
    """
    Get start attributes cutting threshold

    Parameters
    ----------
    salist
        Sorted start attributes list
    decreasing_factor
        Decreasing factor of the algorithm

    Returns
    ---------
    threshold
        Start attributes cutting threshold
    """
    threshold = salist[0][1]
    for i in range(1, len(salist)):
        value = salist[i][1]
        if value > threshold * decreasing_factor:
            threshold = value
    return threshold