Score : 66 points
Summer vacation ended at last and the second semester has begun. You, a Kyoto University student, came to university and heard a rumor that somebody will barricade the entrance of your classroom. The barricade will be built just before the start of the A-th class and removed by Kyoto University students just before the start of the B-th class. All the classes conducted when the barricade is blocking the entrance will be cancelled and you will not be able to attend them. Today you take N classes and class i is conducted in the t_i-th period. You take at most one class in each period. Find the number of classes you can attend.
N, A and B are given on the first line and t_i is given on the (i+1)-th line.
N A B t1 : tN
Print the number of classes you can attend.
5 5 9 4 3 6 9 1
4
You can not only attend the third class.
5 4 9 5 6 7 8 9
1
You can only attend the fifth class.
4 3 6 9 6 8 1
4
You can attend all the classes.
2 1 2 1 2
1
You can not attend the first class, but can attend the second.