/ ___\ / ___\
| 3 3*I*\/ 3 | | 3 3*I*\/ 3 |
| - -- - ---------| | - -- + ---------|
/ 3 \ | 80 80 | | 80 80 |
|x - -----|*|x - ----------------|*|x - ----------------|
| 2| | 2 | | 2 |
\ 40*y / \ y / \ y / 3 6
-27 + 64000*x *y
-----------------
1000 / 2\ / 2 2 4\
\-3 + 40*x*y /*\9 + 120*x*y + 1600*x *y /
------------------------------------------
1000