import os
import sys

#definisco funzione per human readable size
def sizeof_fmt(num):
	for x in ['bytes','KB','MB','GB','TB']:
		if num < 1024.0:
			return "%3.1f%s" % (num, x)
		num /= 1024.0

grand_total = 0

file_with_sizes = open(sys.argv[1])

for line in file_with_sizes:
	curr_file_size=os.path.getsize( line.strip() )
	grand_total += curr_file_size

print "Total is " + str( sizeof_fmt(grand_total) )