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.

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

public class Main {

    static class Reader
    {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader()
        {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }
        public String readLine() throws IOException
        {
            byte[] buf = new byte[1000001]; // line length
            int cnt = 0, c;
            while((c = read()) <= ' '){}
            do{
                if (c == 13 || c == 10)
                    break;
                buf[cnt++] = (byte) c;
            }while ((c = read()) != -1);
            return new String(buf, 0, cnt);
        }
        public String next() throws IOException
        {
            byte[] buf = new byte[1000001]; // line length
            int cnt = 0, c;
            while((c = read()) <= ' '){}
            do{
                buf[cnt++] = (byte) c;
            }while ((c = read()) != -1 && c > ' ');
            return new String(buf, 0, cnt);
        }
        public int[] nextArray(int N) throws IOException{
            int[] arr = new int[N];
            for(int i = 0;i<N;i++)arr[i] = nextInt();
            return arr;
        }

        public int nextInt() throws IOException
        {
            int ret = 0;
            byte c = read();
            while (c <= ' '){c = read();}
            boolean neg = (c == '-');
            if (neg)c = read();
            do
            {
                ret = ret * 10 + c - '0';
            }  while ((c = read()) >= '0' && c <= '9');

            if (neg) return -ret;
            return ret;
        }

        public long nextLong() throws IOException
        {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            }
            while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException
        {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            }
            while ((c = read()) >= '0' && c <= '9');

            if (c == '.')
            {
                while ((c = read()) >= '0' && c <= '9')
                {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException
        {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException
        {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException
        {
            if (din == null)
                return;
            din.close();
        }
    }
    public static void print(int[] arr){
        for(int i = 0 ;i<arr.length;i++){
            System.out.print((arr[i])+" ");
        }
        System.out.println("");
    }
    public static void print(int[][] arr){
        for(int i = 0 ;i<arr.length;i++) {
            for (int j = 0; j < arr[0].length; j++) {
                System.out.print(arr[i][j] + " ");
            }
            System.out.println("");
        }
    }
    public static void print(ArrayList<Integer> arr){
        for(int i:arr){
            System.out.print(i+" ");
        }
        System.out.println("");
    }


    static long prime = 1000000007;
    public static void main(String[] args) throws IOException {
        Reader sc = new Reader();
        PrintWriter pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
        int tc = sc.nextInt();
        while (tc-- > 0){
            int N = sc.nextInt();
            int X = sc.nextInt();
            int M = sc.nextInt();
            int min = X;
            int max = X;
            for(int i = 0;i<M;i++){
                int l = sc.nextInt(),r = sc.nextInt();
                if(r<min || l>max)continue;
                else{
                    min = Math.min(min,l);
                    max = Math.max(max,r);
                }
            }
            pw.println((max-min+1));
        }
        pw.flush();
    }
}