How many United States presidents did not have any biological children?
5
1
1
1
1
1
1
2
1
2
1
2
1
2
1
2
1
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
0
1
5
4
3
2
0
5
4
3
2
5
0
4
3
2
5
4
3
2
0
5
4
3
2
0
5
4
3
2
6
5
4
3
6
5
4
3
6
5
4
3
6
5
4
3
7
6
5
4
3
7
6
5
4
3
7
6
5
7
6
5
8
7
6
5
8
7
6
9
5
8
7
6
9
8
One
7
6
9
11
8
One
7
6
9
11
8
One
7
6
9
11
8
One
7
6
9
11
10
8
One
7
6
9
11
10
8
One
7
6
9
11
10
8
One
7
6
9
11
10
13
8
One
7
6
9
11
10
13
8
One
12
7
6
9
11
10
13
ONE
ONE
ONE
ONE
ONE
One.
66
62