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Problem: Shopping Malls

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Shopping Malls

Input File: mallsin.txt
Output File: mallsout.txt
Time Limit: 0.1 seconds

You have been hired by a company which needs to place an information booth in a shopping mall. The shopping mall also contains four fake trees to add ambience to a shopper's experience. The company wishes to know how many positions the information booth could be placed in, as part of a feasibility study into hiring a consultant to determine the best position for the booth.

Your job is to write a program to determine the number of positions in which the booth can be placed, subject to the following restrictions:

  1. The mall is rectangular, and measures w metres east-west and h metres north-south.
  2. The booth is also rectangular, and the architects have determined that it must face the mall entrance and have its walls parallel to the mall. It measures x metres east-west and y metres north-south.
  3. Due to the cost of custom manufacturing tiles, the booth must be placed an integral number of metres (i.e., 0,1,2,...) from the edge of the mall in both directions, so as to avoid needing to cut any of the metre square tiles used for flooring.
  4. Militant interior decorators have already decided the locations of the one metre by one metre pots containing the trees. Of course, due to the tiling restrictions, these are also an integral number of metres from the edges of the mall.
  5. Note that the booth and the pots are allowed to touch any of the walls of the mall.

Input

The input file will contain five lines of integers, separated by spaces, in the following form:

You may assume:

All measurements are in metres and are illustrated in the figure below (although this diagram shows only one of the four pots).

Output

The output should consist of a single line containing a single integer, representing the total number of positions in which the booth may be placed.

Sample Input

The sample input below corresponds to the configuration shown in the figure above.

6 4 1 2
0 1
2 2
4 1
4 2

Sample Output

11

Scoring

The score for each input scenario will be 100% if the correct answer is written to the output file, and 0% otherwise.

 


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