#include <bits/stdc++.h>
#define Nmax 100009

using namespace std;

#define USE_FILES 1

#ifdef USE_FILES
ifstream fin("dfs.in");
ofstream fout("dfs.out");
#define cin fin
#define cout fout
#endif // USE_FILES

int n,m,x,y,sol;
vector<int> G[Nmax];
vector <int> cc[Nmax];
bitset <Nmax> viz;

void DFS(int node) {

    viz[node]=1;

    for (auto x: G[node])
        if (!viz[x]) DFS(x);

}

int main() {

    cin>>n>>m;
    for (int i=1; i<=m; ++i) {

        cin>>x>>y;

        G[x].push_back(y);
        G[y].push_back(x);
    }

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

        if (!viz[i]) {
            ++sol;
            DFS(i);
        }
    }

    cout<<sol<<'\n';
    return 0;
}