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

using namespace std;

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

const int DIM = 1e5 + 7;

vector <int> v[DIM];

bool viz[DIM];

void dfs(int x)
{
    viz[x] = true;

    for(int i = 0; i < v[x].size(); i++)
        if(viz[v[x][i]] == false)
          dfs(v[x][i]);

}
int main()
{
    int n,m;
    in >> n >> m;
    while(m--)
    {
        int x, y;
        in >> x >> y;
        v[x].push_back(y);
        v[y].push_back(x);
    }
    int k = 0;
    for(int i = 1;i <= n;i++)
    {
        if(viz[i] == false)
        {
            k++;
            dfs(i);
        }
    }

    out << k;
    return 0;
}