How many presidents have not had pets?
3
1
1
1
1
1
1
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
3
1
4
2
3
1
4
2
3
1
4
2
3
1
5
4
2
3
1
5
4
2
3
1
5
4
2
3
5
4
2
0
3
5
4
2
3
0
5
4
2
3
5
4
0
2
3
5
4
2
0
3
5
4
2
3
0
5
4
6
3
5
4
6
0
3
5
4
6
3
5
4
6
3
5
4
6
3
7
5
4
6
3
7
5
4
6
3
7
5
4
6
7
5
6
7
8
5
6
7
8
5
6
7
One
9
8
6
7
One
9
8
6
7
One
9
8
6
11
7
One
9
8
6
11
7
One
9
8
6
11
7
One
9
8
10
6
11
7
One
9
8
10
6
11
7
One
9
8
10
6
11
7
One
9
8
10
6
13
11
7
One
9
8
10
12
13
11
7
One
9
8
ONE
ONE
ONE
ONE
ONE
One.