how many tables

//java

//http://acm.hdu.edu.cn/showproblem.php?pid=1213

import java.util.Arrays;

import java.util.Scanner;

public class Main {

static Scanner inScanner=new Scanner (System.in);

static int peo;

static int[] rel=new int[1010];

static int count;

static int findrel(int t){

if(rel[t]==-1)

return t;

return findrel(rel[t]);

}

static void addp(int x,int y){

int po1=findrel(x);

int po2=findrel(y);

if(po1!=po2)

rel[po1]=po2;

}

public static void main(String[] args) {

// TODO Auto-generated method stub

while(inScanner.hasNext()){

int num=inScanner.nextInt();

while(num--!=0){

count=0;

peo=inScanner.nextInt();

Arrays.fill(rel, -1);

int fri=inScanner.nextInt();

while(fri--!=0){

int x=inScanner.nextInt();

int y=inScanner.nextInt();

addp(x, y);

}

for(int i=1;i<=peo;i++){

if(rel[i]==-1){

count++;

}

}

System.out.println(count);

}

}

}

}