import sys
sys.setrecursionlimit(1000000000)

#
# Solution Template for A Mindbending Scenario
# 
# This file is provided to assist with reading and writing of the input
# files for the problem. You may modify this file however you wish, or
# you may choose not to use this file at all.
#

# Open the input and output files.
input_file = open("bendin.txt", "r")
output_file = open("bendout.txt", "w")

r1_x1 = None
r1_y1 = None
r1_x2 = None
r1_y2 = None
r2_x1 = None
r2_y1 = None
r2_x2 = None
r2_y2 = None

# Read the values from the input file.
input_line = input_file.readline().strip()
r1_x1, r1_y1, r1_x2, r1_y2 = map(int, input_line.split())
input_line = input_file.readline().strip()
r2_x1, r2_y1, r2_x2, r2_y2 = map(int, input_line.split())

# TODO: This is where you should compute the answer and store it into the
# variable answer.

answer = None

# Write the answer to the output file.
output_file.write("%d\n" % (answer))

# Finally, close the input/output files.
input_file.close()
output_file.close()