How many U.S. presidents were not married?
1
1
1
1
1
1
1
2
1
2
1
2
1
2
1
2
1
2
1
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
0
3
2
1
5
4
3
2
0
1
5
4
3
2
5
4
0
3
2
5
4
0
3
2
5
4
3
2
5
4
3
2
5
4
6
3
One
2
5
4
6
3
One
5
4
6
3
One
5
4
6
3
One
5
4
6
7
3
One
5
4
6
7
3
One
5
4
6
7
3
One
5
4
6
7
One
5
8
6
7
One
5
8
9
6
7
One
5
8
9
11
6
7
One
8
9
11
6
7
One
8
9
11
6
7
Two
One
8
9
11
6
7
Two
One
8
9
11
6
7
Two
One
10
8
9
11
6
7
Two
One
No
10
8
9
11
6
7
Two
One
No
10
8
9
13
11
6
7
Two
One
ONE
ONE
ONE
ONE
One.
One.
One.