How many countries in South America are landlocked?
2
1
3
1
3
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
2
5
4
1
3
0
2
5
4
1
3
2
5
0
4
6
1
3
2
5
4
0
6
1
3
7
2
5
4
6
1
3
7
2
5
4
6
1
3
7
2
5
4
6
1
3
7
2
5
4
6
1
3
7
2
5
4
8
6
1
3
7
2
9
5
4
8
6
1
3
7
2
9
5
4
8
6
7
2
9
5
4
8
6
7
2
9
5
10
8
11
6
7
9
10
8
11
6
7
9
10
8
11
6
13
7
9
10
8
11
6
13
7
9
10
8
12
11
6
13
7
9
10
8
12
11
6
13
7
9
10
8
12
11
14
6
13
7
9
10
8
12
11
14
6
13
7
9
10
8
12
11
128
128
128
128
128
128