#include <iostream>
#include <vector>
#include <fstream>
using namespace std;

ifstream f("dfs.in");
ofstream o("dfs.out");
const int nmax = 10000;
vector<int> G[nmax];
int vis[nmax+1];
void DFS(int x){
    vis[x]=1;
    for(auto next:G[x])
    {
        if(!vis[next])DFS(next);
    }

}

int main()
{
    int n,m;
    f >> n >> m;
    for (int i = 1; i<=m; i++)
    {
        int x,y;
        f>>x>>y;
        G[x].push_back(y);
        G[y].push_back(x);
    }
    int cc =  0;
    for(int i = 1; i<=n; i++){
        if(!vis[i]){
            cc++;
            DFS(i);
        }
    }
    o<<cc;
}