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 sys 
import math
from collections import Counter
from operator import itemgetter
import queue

def IO():
	sys.stdin=open("pyinput.txt", 'r')
	sys.stdout=open("pyoutput.txt", 'w')

def GCD(a, b):
	if(b==0): return a
	else: return GCD(b, a%b)

def LCM(a, b): return a*(b//GCD(a, b))

def scan(TYPE_1, TYPE_2=0):
	if(TYPE_1==int):
		return map(int, sys.stdin.readline().strip().split())
	elif(TYPE_1==float):
		return map(float, sys.stdin.readline().strip().split())
	elif(TYPE_1==list and TYPE_2==float):
		return list(map(float, sys.stdin.readline().strip().split()))
	elif(TYPE_1==list and TYPE_2==int):
		return list(map(int, ('0 '+sys.stdin.readline()).strip().split()))
	elif(TYPE_1==str):
		return sys.stdin.readline().strip()
	else: print("ERROR!!!!") 


def main():

	t=int(input())
	while(t>0):
		n, x, m=scan(int)
		l=x
		r=x

		while(m>0):
			a, b=scan(int)
			if(l<=a<=r or l<=b<=r or a<=l<=b or a<=r<=b):
				l=min(a, l)
				r=max(b, r)


			m-=1

		print(r-l+1)

		t-=1



# IO()
main()