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*/

#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)
void solve(); int main() { cin.tie(0); ios::sync_with_stdio(false); solve(); }
//---------------------------------------------------------------------------------------------------





int N, M;
vector<int> E[101010];
int vis[101010];
void solve() {
    cin >> N >> M;
    rep(i, 0, M) {
        int a, b, c;
        cin >> a >> b >> c;
        E[a].push_back(b);
        E[b].push_back(a);
    }

    int ans = 0;
    rep(i, 1, N + 1) if(!vis[i]){
        queue<int> que;
        ans++;
        que.push(i);
        vis[i] = 1;
        while (!que.empty()) {
            int q = que.front(); que.pop();
            for (int j : E[q]) if(!vis[j]){
                vis[j] = 1;
                que.push(j);
            }
        }
    }

    cout << ans << endl;
}