Count the number of marker (line) in a BIM file.

    :param inputFileName: the name of the ``bim`` file.

    :type inputFileName: str

    :returns: the number of marker in the ``bim`` file.

def computeNumberOfMarkers(inputFileName):
    """Count the number of marker (line) in a BIM file.

    :param inputFileName: the name of the ``bim`` file.

    :type inputFileName: str

    :returns: the number of marker in the ``bim`` file.

    """
    nbLine = 0
    with open(inputFileName, "r") as inputFile:
        nbLine = len(inputFile.readlines())

    return nbLine