80 100
60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 60 90 
      0	      0
   1000       0
      0    1000
  -1000       0
     -0   -1000
   2000       0
      0    2000
  -2000       0
     -0   -2000
   3000       0
       0   3000
   -3000      0
      -0  -3000
    4000      0
       0   4000
   -4000      0
      -1  -4000
    5000      0
       0   5000
   -5000      0
      -1  -5000
    6000      0
       0   6000
   -6000      1
      -1  -6000
    7000      0
       0   7000
   -7000      1
      -1  -7000
    8000      0
       0   8000
   -8000      1
      -1  -8000
    9000      0
       0   9000
   -9000      1
      -1  -9000
   10000      0
       0  10000
  -10000      1
      -1 -10000
   11000      0
       1  11000
  -11000      1
      -2 -11000
   12000      0
       1  12000
  -12000      1
      -2 -12000
   13000      0
       1  13000
  -13000      1
      -2 -13000
   14000      0
       1  14000
  -14000      1
      -2 -14000
   15000      0
       1  15000
  -15000      1
      -2 -15000
   16000      0
       1  16000
  -16000      1
      -2 -16000
   17000      0
       1  17000
  -17000      2
      -2 -17000
   18000      0
       1  18000
  -18000      2
      -3 -18000
   19000      0
       1  19000
  -19000      2
      -3 -19000
   20000      0
       1  20000
  -20000      2
      -3 -20000
