How many US presidents have been unanimously elected?
1
1
1
1
2
1
2
1
2
3
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
0
2
3
4
1
5
0
2
3
4
1
5
2
3
0
4
1
5
2
3
4
1
5
0
2
3
4
1
5
0
2
3
4
1
5
6
2
3
0
4
5
6
2
3
7
4
5
6
2
3
7
4
5
6
3
7
4
5
6
3
7
4
5
6
7
4
5
6
8
7
5
6
8
9
7
5
6
11
8
9
7
5
6
11
8
9
7
6
11
8
9
7
6
11
8
9
7
6
11
8
9
7
10
6
11
8
9
7
10
6
13
11
8
9
7
12
10
6
13
11
8
9
7
12
10
6
13
11
8
9
7
12
10
6
13
11
8
9
7
12
10
6
13
11
8
9
66
66
66
59
62
61
58