How many US presidents were involved in the Vietnam war?
5
1
1
3
1
2
3
4
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
0
4
5
1
2
3
4
0
5
1
2
3
4
5
1
2
6
3
4
5
1
2
6
3
4
5
1
2
6
3
4
5
1
2
6
3
4
5
2
6
3
4
7
5
2
6
4
7
5
6
7
5
6
7
5
6
7
5
8
6
7
5
8
9
6
7
8
9
6
7
8
9
6
11
7
8
9
6
11
7
8
9
6
11
7
10
8
9
6
11
7
10
8
9
6
11
13
7
10
8
9
6
11
12
13
7
10
8
9
6
11
12
13
7
10
8
9
6
11
12
13
7
10
8
9
11
14
12
13
7
10
8
9
11
ONE
ONE
66
66
62
61
62