How many countries have a population greater than one billion?
2
1
5
1
3
4
5
1
3
2
4
5
1
3
2
4
5
1
3
2
4
5
1
3
2
4
5
1
3
2
4
5
6
1
3
2
4
5
6
1
3
2
4
5
6
7
1
3
2
4
5
6
7
1
3
2
4
5
6
7
1
3
2
4
5
6
7
1
3
2
4
5
6
7
1
3
2
4
5
6
7
1
3
2
4
5
6
7
1
9
3
8
2
4
5
0
6
7
1
9
3
8
2
4
5
6
7
1
9
0
3
8
2
4
5
6
11
7
1
9
3
8
10
2
0
4
5
6
11
7
1
9
3
8
10
2
4
5
0
6
11
7
9
12
3
8
10
2
4
6
11
7
9
12
8
10
2
6
11
7
9
12
8
10
6
11
7
9
13
12
8
10
6
11
7
9
13
12
8
128
10
6
11
7
14
9
13
12
8
10
128
6
11
7
14
9
128
128
128
66
128