You are given an array consisting of n integers a_1, a_2, ..., a_n. Initially a_x = 1, all other elements are equal to 0.

You have to perform m operations. During the i-th operation, you choose two indices c and d such that l_i ≤ c, d ≤ r_i, and swap a_c and a_d.

Calculate the number of indices k such that it is possible to choose the operations so that a_k = 1 in the end.

Input

The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases. Then the description of t testcases follow.

The first line of each test case contains three integers n, x and m (1 ≤ n ≤ 10^9; 1 ≤ m ≤ 100; 1 ≤ x ≤ n).

Each of next m lines contains the descriptions of the operations; the i-th line contains two integers l_i and r_i (1 ≤ l_i ≤ r_i ≤ n).

Output

For each test case print one integer — the number of indices k such that it is possible to choose the operations so that a_k = 1 in the end.

Example

Input


3
6 4 3
1 6
2 3
5 5
4 1 2
2 4
1 2
3 3 2
2 3
1 2


Output


6
2
3

Note

In the first test case, it is possible to achieve a_k = 1 for every k. To do so, you may use the following operations:

  1. swap a_k and a_4; 
  2. swap a_2 and a_2; 
  3. swap a_5 and a_5. 



In the second test case, only k = 1 and k = 2 are possible answers. To achieve a_1 = 1, you have to swap a_1 and a_1 during the second operation. To achieve a_2 = 1, you have to swap a_1 and a_2 during the second operation.
/**
 * @author egaeus
 * @mail sebegaeusprogram@gmail.com
 * @veredict Not sended
 * @url <https://codeforces.com/problemset/problem/CF1366B>
 * @category ?
 * @date 11/06/2020
 **/

import java.io.*;
import java.util.*;

import static java.lang.Integer.*;
import static java.lang.Math.*;

public class CF1366B {
    public static void main(String args[]) throws Throwable {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int T = parseInt(in.readLine());
        for (int t = 0; t < T; t++) {
            StringTokenizer st = new StringTokenizer(in.readLine());
            int N = parseInt(st.nextToken()), X = parseInt(st.nextToken()), M = parseInt(st.nextToken());
            int[] range = new int[]{X, X};
            for (int i = 0; i < M; i++) {
                st = new StringTokenizer(in.readLine());
                int a = parseInt(st.nextToken()), b = parseInt(st.nextToken());
                if ((a >= range[0] && a <= range[1]) ||
                        (b >= range[0] && b <= range[1]) ||
                        (range[0] >= a && range[0] <= b) ||
                        (range[1] >= a && range[1] <= b)) {
                    range[0] = Math.min(a, range[0]);
                    range[1] = Math.max(b, range[1]);
                }
            }
            System.out.println(range[1]-range[0]+1);
        }
    }
}
