How many U.S. presidents died in office of natural causes?
4
1
2
1
2
1
2
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
2
3
5
4
1
0
2
3
5
4
1
2
3
0
5
4
1
2
3
5
4
0
1
2
3
5
4
1
0
2
3
5
4
1
2
6
3
5
4
1
2
6
3
5
4
1
2
6
3
5
4
1
2
6
3
5
4
7
1
2
6
3
5
4
7
6
3
5
4
7
6
3
5
4
7
8
6
3
5
4
7
8
9
6
5
7
8
9
6
5
7
8
9
11
6
5
7
8
9
11
6
7
8
9
11
10
6
7
8
9
11
10
6
7
8
9
11
10
13
6
7
8
9
11
10
13
6
7
8
9
11
10
13
12
6
7
8
9
11
10
13
12
6
7
8
9
11
10
13
12
6
7
14
8
9
11
10
62
66
62
66
59
62
61
66
112