How many former U.S. presidents are still alive?
5
2
2
2
2
2
4
3
2
4
3
2
4
3
2
4
3
2
4
3
2
4
1
3
2
4
1
3
2
4
1
3
5
2
4
1
3
5
2
4
1
3
5
2
4
1
3
5
2
7
4
1
3
5
2
7
4
1
3
0
5
2
7
4
1
3
5
2
0
7
4
1
3
5
2
7
4
0
1
3
5
7
4
1
3
0
5
7
4
1
3
5
0
7
6
4
1
3
5
7
6
4
0
1
3
5
8
7
6
1
0
5
8
7
6
1
5
8
9
0
7
6
1
5
8
9
7
6
0
1
5
8
9
7
6
1
5
8
9
7
6
5
8
9
7
6
13
5
8
9
7
6
13
8
9
10
7
6
11
13
8
9
10
7
6
11
13
8
9
10
7
6
11
13
8
9
10
6
11
13
8
9
10
6
11
13
8
9
10
6
11
13
8
9
10
6
2 of them
11
13
8
9