Problem:
Score : 200 points

Problem Statement

There are N rectangular plate materials made of special metal called AtCoder Alloy.
The dimensions of the i-th material are A_i \times B_i (A_i vertically and B_i horizontally).

Takahashi wants a rectangular plate made of AtCoder Alloy whose dimensions are exactly H \times W.
He is trying to obtain such a plate by choosing one of the N materials and cutting it if necessary.
When cutting a material, the cuts must be parallel to one of the sides of the material.
Also, the materials have fixed directions and cannot be rotated.
For example, a 5 \times 3 material cannot be used as a 3 \times 5 plate.

Out of the N materials, how many can produce an H \times W plate if properly cut?

Constraints

1 \leq N \leq 1000

1 \leq H \leq 10^9

1 \leq W \leq 10^9

1 \leq A_i \leq 10^9

1 \leq B_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N H W
A_1 B_1
A_2 B_2
:
A_N B_N

Output

Print the answer.

Sample Input 1

3 5 2
10 3
5 2
2 5

Sample Output 1

2

Takahashi wants a 5 \times 2 plate.

The dimensions of the first material are 10 \times 3. We can obtain a 5 \times 2 plate by properly cutting it.

The dimensions of the second material are 5 \times 2. We can obtain a 5 \times 2 plate without cutting it.

The dimensions of the third material are 2 \times 5. We cannot obtain a 5 \times 2 plate, whatever cuts are made. Note that the material cannot be rotated and used as a 5 \times 2 plate.

Sample Input 2

10 587586158 185430194
894597290 708587790
680395892 306946994
590262034 785368612
922328576 106880540
847058850 326169610
936315062 193149191
702035777 223363392
11672949 146832978
779291680 334178158
615808191 701464268

Sample Output 2

8

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

namespace B___AtCoder_Alloy
{
    class Program
    {
        static void Main(string[] args)
        {
            var inputFirstLine = Console.ReadLine().Split(' ');
            int result = 0;

            // 素材の枚数
            int n = int.Parse(inputFirstLine[0]);

            // ほしい板の縦の長さ
            int h = int.Parse(inputFirstLine[1]);

            // ほしい板の横の長さ
            int w = int.Parse(inputFirstLine[2]);

            for (int i = 0; i < n; i++)
            {
                var inputLine = Console.ReadLine().Split(' ');

                // i 番目の素材の縦の長さ
                int ai = int.Parse(inputLine[0]);

                // i 番目の素材の横の長さ
                int bi = int.Parse(inputLine[1]);

                if (ai >= h && bi >= w)
                {
                    result++;
                }
            }

            Console.WriteLine(result.ToString());
        }
    }
}