#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("dfs.in", "r", stdin);
    freopen("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++;
        }
    }
    return 0;
}