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/usr/bin/matho-sum is in mathomatic-primes 16.0.4-1.

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#!/usr/bin/python

# Python program to sum many large integers separated by spaces or newlines.
# The integers to sum may be entered on the command-line or into standard input.

import string
import sys

sum = 0 # initialize sum and make it an integer
args = sys.argv[1:]
if (args == []):
	# read stdin if no command line args
	while True:
		try:
			input_line = raw_input()
		except:
			break;
		for s in string.split(input_line):
			sum += int(s)
else:
	# sum together the command-line args
	for arg in args:
		sum += int(arg)
print sum