1000 
1000
400
100
+0
1000
1000
400
100
+1
1000
1000
400
100
+2
1000
1000
400
100
+1
1
1
1
1000
1000
400
100
+4
1000
1000
400
100
+4
1
1000
1000
400
100
+2
1000
1000
400
100
+6
