bit
3
1
3
1
1000 
1000
400
100
+51
1000
1000
400
100
+62
1
1000
1000
400
100
+89
2
1000
1000
400
100
+3
1000
1000
400
100
+2
1000
1000
400
100
+19
1000
1000
400
100
+55
1000
1000
400
100
+44