How many books are in the Harry Potter series?
7
5
5
5
5
3
5
3
4
5
3
4
5
3
4
5
3
4
7
5
3
4
7
5
3
4
7
5
3
4
7
5
3
4
6
7
5
3
4
6
7
5
3
4
6
7
5
3
4
6
7
2
5
3
4
6
7
2
5
3
4
6
7
2
5
3
4
6
7
2
5
3
4
6
7
8
2
5
3
4
6
7
8
2
3
4
6
7
8
1
2
3
4
6
7
8
1
2
3
4
6
7
9
8
1
2
4
6
7
9
8
1
2
11
6
7
9
8
1
0
2
11
10
6
7
9
8
1
2
11
10
6
7
9
8
1
2
11
10
6
9
12
8
1
2
11
10
6
9
12
13
8
1
2
11
10
6
9
16
12
13
8
1
2
11
10
6
9
16
12
13
8
1
2
11
10
9
16
12
13
8
1
2
11
10
9
16
12
13
8
1
2
11
116
132
114
66
108
121
192
168