How many presidents were never married?
1
1
1
1
1
1
1
1
2
1
2
1
2
1
2
1
2
1
2
4
1
3
2
4
1
3
2
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
3
0
2
5
4
3
2
0
5
4
3
2
5
0
4
3
2
5
4
3
0
6
2
5
4
3
6
2
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
8
7
6
9
8
7
6
One
9
8
7
6
One
11
9
8
7
6
One
11
9
8
7
6
One
11
9
8
7
6
One
11
9
10
8
7
6
One
11
9
10
8
7
6
One
11
9
10
8
7
6
One
13
11
9
10
8
7
One
13
11
9
10
8
12
7
One
13
11
ONE
ONE
ONE
One.
ONE
One.
66