How many Harry Potter books were written?
7
5
5
4
3
5
4
3
5
4
3
5
4
3
5
4
3
5
4
3
5
4
7
3
5
4
7
3
5
4
6
7
3
5
2
4
6
7
3
5
2
4
6
7
3
5
2
4
6
7
3
5
2
4
6
7
3
5
2
4
6
8
7
3
5
2
4
6
8
7
3
1
5
2
4
6
8
7
3
1
5
2
4
6
8
7
3
1
5
2
4
6
8
7
3
1
5
2
4
9
6
8
7
3
1
2
4
9
6
11
8
7
3
1
2
9
6
10
11
8
7
1
2
9
6
10
11
8
7
1
2
9
12
6
10
11
13
8
7
1
2
16
9
12
6
0
10
11
13
8
7
1
2
16
9
12
6
10
11
13
8
0
7
1
2
16
9
12
6
10
11
13
8
7
0
1
2
16
9
12
6
10
11
13
8
1
2
66
16
9
14
12
6
0
66
0
66
0
168
66
132