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时钟

Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 2516    Accepted Submission(s): 784


Problem Description
从a点b分到s点t分时针和分针重合多少次?
 

Input
有多组数据，每组1行4个数 a,b,s,t. 1<=a,s <=12, 0<=b,t<60. 0 0 0 0结束.
 

Output
参看Sample output
 

Sample Input
12 50 1 2 
3 8 3 20 
2 45 11 0 
11 0 3 20 
1 2 12 50 
3 20 3 8
0 0 0 0
 

Sample Output
0
1
8
4
11
10
 

Author
zhousc
 

Source
ECJTU 2008 Summer Contest
 

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