/*
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*/
#include "bits/stdc++.h"
using namespace std;
#define ok1 printf("ok1\n")
#define ok2 printf("ok2\n")
#define M 1000000000000000000LL
#define rep(i,n) for(int i=0;i<n;++i)
#define REP(i,s,n) for(int i=(s);i<(n);++i)
#define repr(i,n) for(int i=n-1;i>=0;--i)
#define REPR(i,s,n) for(int i=(s);i>=(n);--(i))
#define all(a) (a).begin(),(a).end()
#define reall(a) (a).rbegin(),(a).rend()
#define pb emplace_back //emplace_backの方が速いが使い慣れてないため
#define DOUBLE fixed << setprecision(15)
#define fi first
#define se second
#define mp make_pair
#define mp make_tuple
#define BIT(n,m)(((n)>>(m))&1)
const double pi = acos(-1.0);
typedef vector<int> vi;
typedef vector<string> vs;
typedef long long ll;
typedef vector<ll> vll;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef vector<char> vc;
typedef vector<double> vd;
typedef vector<bool> vb;
typedef deque<ll> dll;
typedef pair<ll, ll> P;
typedef vector<P> vP;
const ll mod = 1e9 + 7;
//const ll mod = 998244353;
ll dy[4] = { 1,0,-1,0 };
ll dx[4] = { 0,1,0,-1 };
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template< typename T >
struct edge {
	int src, to;
	T cost;

	edge(int to, T cost) : src(-1), to(to), cost(cost) {}

	edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}

	edge &operator=(const int &x) {
		to = x;
		return *this;
	}

	operator int() const { return to; }
};

template< typename T >
using Edges = vector< edge< T > >;
template< typename T >
using WeightedGraph = vector< Edges< T > >;
using UnWeightedGraph = vector< vector< int > >;
template< typename T >
using Matrix = vector< vector< T > >;
bool out_check(ll a, ll b) { return (0 <= a && a < b); }
void addmod(ll &a, ll &b) { a = (a + b) % mod; }
void Pvll(vll v) {
	puts("vll------------------------------------------------");
	rep(i, v.size()) cout << v[i] << " "; puts("");
	puts("------------------------------------------------");
}
void Pvvll(vvll v) {
	puts("vvll------------------------------------------------");
	rep(i, v.size()) { rep(j, v[i].size()) cout << v[i][j] << " "; cout << endl; }
	puts("------------------------------------------------");
}
void Pvs(vs s) {
	puts("vs------------------------------------------------");
	rep(i, s.size()) { rep(j, s[i].size()) cout << s[i][j] << " "; cout << endl; }
	puts("------------------------------------------------");
}

void Yes(bool x) { cout << ((x) ? "Yes\n" : "No\n"); }
void YES(bool x) { cout << ((x) ? "YES\n" : "NO\n"); }
void yes(bool x) { cout << ((x) ? "yes\n" : "no\n"); }
void Yay(bool x) { cout << ((x) ? "Yay!\n" : ":(\n"); }

ll  n, m, d, r, l, k, h, ans, ret = M;
bool flag = false, flag2 = false, flag3 = false;
//string s, t, u;
struct UnionFind {
	vector<long long> data;
	UnionFind(long long size) : data(size, -1) { }
	bool unite(long long x, long long y) {
		x = root(x); y = root(y);
		if (x != y) {
			if (data[y] < data[x]) swap(x, y);
			data[x] += data[y]; data[y] = x;
		}
		return x != y;
	}
	bool same(long long x, long long y) {
		return root(x) == root(y);
	}
	int root(long long x) {
		return data[x] < 0 ? x : data[x] = root(data[x]);
	}
	int size(long long x) {
		return -data[root(x)];
	}
};
int main() {
	cin.tie(0); ios::sync_with_stdio(false);//not intractive
	cin >> n >> m;
	vll check(n, 0);
	UnionFind tree(n);
	rep(i, m) {
		ll x, y, z; cin >> x >> y >> z; x--, y--;
		tree.unite(x, y);
	}
	rep(i, n) if (!check[tree.root(i)])ans++, check[tree.root(i)] = 1;
	cout << ans << endl;
	return 0;
}

Measured memory_bytes: 1792