#include <fstream>
#include <vector>

using namespace std;

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

vector <int> g[10005];
int n, m, x, y, nr=0;
bool viz[10005];

void dfs(int nod)
{
    viz[nod]=1;
    for (int i=0; i<g[nod].size(); i++)
        if(!viz[g[nod][i]])
        {
            viz[g[nod][i]]=1;
            dfs(g[nod][i]);
        }
}

int main()
{
    fin >> n >> m;
    for (int i=1; i<=m; i++)
        {
            fin >> x >> y;
            g[x].push_back(y);
            g[y].push_back(x);
        }
    for (int i=1; i<=n; i++)
        if(!viz[i])
            {
                dfs(i);
                nr++;
            }
    fout << nr;
    fin.close();
    fout.close();
    return 0;
}