// rasssschet.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <fstream>

using namespace std;

const int SIZE = 1000;
int p[SIZE];
bool usd[SIZE];
int n, m, f, s, sravn, horda;

int main()
{
	ifstream fin("test4.txt");
	ofstream fout("rex.txt");

	fin >> n >> m;
	for (int i = 1; i <= n; i++){
		p[i] = i;

	}
	for (int i = 0; i < m; i++){
		fin >> f >> s;
		sravn = p[f];
		for (int j = 1; j <= n; j++){
			if (p[j] == sravn)
				p[j] = p[s];
		}
	}
	for (int i = 1; i <= n; i++){
		usd[p[i]] = true;
	}
	int count = 0;
	for (int i = 0; i <= n; i++){
		if (usd[i]) ++count;
	}
	horda = m - n + count;
	fout << horda << endl;
	fin.close();
	fout.close();


}