drzewo
1000 
1000
400
100
+25
1000
1000
400
100
+41
1
1000
1000
400
100
+123
1000
1000
400
100
+75
1000
1000
400
100
+75
1000
1000
400
100
+94
8
1000
1000
400
100
+107
1000
1000
400
100
+105