028.py

#!/usr/bin/python

# import sys

# WIDTH=HEIGHT=7

# def grid_cell(x,y):
# 	if x+y == WIDTH-1 and x >= WIDTH/2:
# 		return ((WIDTH/2-y)*2+1)**2
# 	return 0


# if __name__ == '__main__':
# 	for y in xrange(HEIGHT):
# 		for x in xrange(WIDTH):
# 			print "%02d" % grid_cell(x,y),
# 		sys.stdout.write(" \n")

if __name__ == '__main__':
	total = 1
	for i in xrange(3,1002,2):
		total += 4*i**2 - 6*(i-1)
	print total