SPOJ Brasil

As you might know, Ada the Ladybug is a farmer. She needs to choose some species of vegetables. Each vegetable has four important attributes. We say that a vegetable is worse than another vegetable, if all of its four attributes are greater.

She wants to eliminate the list of vegetables, so only vegetables, which are not worse than any other vegetables remains.

Input

The first line contains integer 1 ≤ N ≤ 2×10⁵

Each of the next N lines contains four integers 1 ≤ X, Y, Z, W ≤ N. It is guaranteed, that all X attributes are distinct for all vegetables. The same is true for Y, Z and W (so in fact, there are four permutations of numbers from 1 to N).

Output

Print the number of vegetables, which are not worse than any other vegetable.

Example Input 1

3
1 1 1 1
2 2 2 2
3 3 3 3

Example Output 1

1

Example Input 2

10
8 9 9 2
3 7 2 4
5 5 10 10
9 3 5 9
4 6 8 6
2 8 1 7
1 2 6 1
7 4 7 5
6 1 3 8
10 10 4 3

Example Output 2

5