/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
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*******************************************************************************/

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

vector<int> l[10001];
int vis[10001];

void dfs(int node) {
    vis[node] = 1;
    for(auto vec : l[node]) {
        if(vis[vec] == 0){
            dfs(vec);
        }
    }
}

int main()
{ 
    int n,m;
    cin>> n >>m;
    for(int i = 1; i <= m; i++) {
        int a,b;
        cin >> a >>b;
        L[a].push_back(b);
        L[b].push_back(a);
    }
    int nr = 0;
    for(int i = 1; i <= n; i++){
        if(vis[i] == 0){
            nr++;
            dfs(i);
        }
    }
    cout << nr;
    }

    return 0;