#include <bits/stdc++.h>
using namespace std;
#define ll long long

int n,m,x,y;
vector <int> g[100001];
int viz[100001];

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

}

int main()
{
    ifstream cin("dfs.in");
    ofstream cout("dfs.out");
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    //read
    cin>>n>>m;
    for (int i=0; i<m; i++){
        cin>>x>>y;
        g[x].push_back(y);
        g[y].push_back(x);
    }

    int res=0;

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

    cout<<res;


    return 0;
}