#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

ifstream fin("dfs.in");
ofstream fout("dfs.out");

const int NMAX = 100005;

vector<int> muchii[NMAX];
int viz[NMAX];

void dfs(int nod) {
    viz[nod] = 1;
    for (auto &nodcrt : muchii[nod]) {
        if (viz[nodcrt] == 0) {
            dfs(nodcrt);
        }
    }
}

int main() {
    int n,m;

    fin >> n >> m;

    for (int i=0; i<m; i++) {
        int x,y;
        fin >> x >> y;
        muchii[x].push_back(y);
        muchii[y].push_back(x);
    }

    int nrcomp = 0;
    for (int i=1; i<=n; i++) {
        if (viz[i] == 0) {
            nrcomp++;
            dfs(i);
        }
    }

    fout << nrcomp;
    return 0;
}