#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys

#main programme
if(__name__ == "__main__"):
	lValues = []
	#extract values
	for iIndex, pEntry in enumerate(sys.argv):
		#skip first entry
		#as it is the programme name
		if(iIndex == 0):
			continue

		#convert them to floats
		lValues.append(float(pEntry))

	fResult = 0.0
	#sum up all values
	for fEntry in lValues:
		fResult += fEntry*fEntry

	#print result
	print '%.16f' % fResult