#!/opt/chipster/tools/Python-2.7.12/bin/python

"""
Print the number of bases in a nib file.

usage: %prog nib_file
"""
from __future__ import print_function

import sys

from bx.seq import nib as seq_nib

nib = seq_nib.NibFile( file( sys.argv[1] ) )
print(nib.length)