#include <iostream>
#include <vector>

using namespace std;
const int NMAX=1e5+2;
vector<int> adj[NMAX];
bool viz[NMAX];

void dfs(int nod)
{
    viz[nod]=1;
    for(auto& to : adj[nod])
    {
        if(!viz[to]){
            dfs(to);
        }
    }
}

int main()
{
    freopen("C:\\Users\\tudor\\CLionProjects\\clasa11\\dfs.in","r",stdin);
    freopen("C:\\Users\\tudor\\CLionProjects\\clasa11\\dfs.out","w",stdout);
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int x,y;
        cin>>x>>y;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    int nrComp=0;
    for(int nod=1;nod<=n;nod++)
    {
        if(!viz[nod])
        {
            dfs(nod);
            nrComp++;
        }
    }
    cout<<nrComp<<'\n';
}