def file_fzp_start(filename):
    """
    finds the start of the fzp data

    :param filename: string of the fzp file name
    :return: number of lines to skip at top of file
    """

    with open(filename) as in_f:
        c= 0
        cols = []
        #find start of VISSIM data
        line = in_f.readline()
        while 'VehNr;' not in line:
            line = in_f.readline()
            cols = [x.strip() for x in line.split(';')][:-1]
            c +=1
        return c