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