How many U.S. presidents were not married?
1
2
2
2
3
2
3
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
7
4
5
1
2
3
7
4
5
1
2
3
7
0
4
5
1
2
3
7
4
6
5
0
1
2
3
7
4
6
5
1
0
2
3
7
4
6
5
1
3
7
0
4
6
5
1
8
3
7
4
6
5
0
1
8
7
4
6
5
1
8
7
4
6
5
8
9
7
6
5
8
9
7
6
5
8
9
7
6
5
8
9
7
6
8
13
9
7
6
8
13
9
7
6
11
8
13
9
7
6
10
11
8
13
9
7
6
10
11
8
13
9
7
6
10
11
8
13
9
7
6
10
11
8
13
9
6
10
11
8
13
9
6
10
11
8
12
13
9
No
6
10
11