4800: P1459 [USACO2.1] 三值的排序 Sorting a Three-Valued Sequence(普及-)
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:0
Solved:0
Description

Input

Output

Sample Input Copy
9
2
2
1
3
3
3
2
3
1
Sample Output Copy
4
HINT
