#include<fstream>
#include<vector>
using namespace std;
ifstream in("dfs.in");
ofstream out("dfs.out");
int n, m, compcon;
bool visited[100001];
vector <int> vertex[100001];
void dfs(int current)
{
int next, i;
visited[current] = true;
for(i=0; i<vertex[current].size(); i++)
{
next = vertex[current][i];
if(!visited[next])
dfs(next);
}
}
int main()
{
int i, x, y;
in>>n>>m;
for(i=1; i<=m; i++)
{
in>>x>>y;
vertex[x].push_back(y);
vertex[y].push_back(x);
}
for(i=1; i<=m; i++)
if(visited[i]) dfs(i);
else compcon++;
out<<compcon;
return 0;
}