How many books are in the Percy Jackson series?
5
3
3
3
5
3
5
4
3
5
4
3
5
4
3
5
4
3
5
4
2
3
5
4
2
3
5
4
2
3
5
4
2
3
7
5
4
2
3
7
5
4
2
3
7
5
6
4
2
3
7
5
6
4
1
2
3
7
5
6
4
1
2
3
7
5
6
4
1
2
3
7
5
6
4
1
8
2
3
7
5
6
4
1
8
2
3
7
5
6
4
1
8
2
7
5
6
4
1
8
2
7
5
6
4
1
9
10
8
2
7
6
4
1
9
11
10
8
2
7
6
1
9
11
12
10
8
2
7
6
1
9
11
13
12
10
8
2
7
6
1
9
11
13
12
10
8
2
7
6
1
9
11
13
12
10
8
2
7
6
1
9
11
13
12
10
8
7
6
1
9
11
13
12
10
8
7
6
1
9
11
13
12
10
8
14
7
6
1
9
11
13
12
10
8
14
6
1
4 books
3 books
7 books