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

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

0
1
8
4
11
10

Author

zhousc