#include <bits/stdc++.h>
using namespace std;
#define GET_MACRO(a, b, c, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep3, rep2)(__VA_ARGS__)
#define rep2(i, a) rep3 (i, 0, a)
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define repr(...) GET_MACRO(__VA_ARGS__, repr3, repr2)(__VA_ARGS__)
#define repr2(i, a) repr3 (i, 0, a)
#define repr3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define FILL(a, b, T) fill_n((T *)a, sizeof(a) / sizeof(T), b)
template<class T1, class T2> inline bool chmin(T1 &a, T2 b) { return b < a && (a = b, true); }
template<class T1, class T2> inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
using ll = long long;

struct UF {
	vector<int> parent, size;
	UF(int n) : parent(n), size(n, 1) {
		rep (i, n) parent[i] = i;
	}
	int root(int x) {
		if (x == parent[x]) return x;
		else return parent[x] = root(parent[x]);
	}
	void merge(int x, int y) {
		x = root(x); y = root(y);
		if (x == y) return;
		if (size[x] < size[y]) swap(x, y);
		size[x] += size[y];
		parent[y] = x;
	}
	bool same(int x, int y) {
		return root(x) == root(y);
	}
};

int main() {
	int N, M;
	cin >> N >> M;
	UF uf(N);
	rep (i, M) {
		int a, b, c;
		scanf("%d %d %d", &a, &b, &c);
		uf.merge(a - 1, b - 1);
	}
	int ans = 0;
	rep (i, N) if (uf.root(i) == i) {
		ans++;
	}
	cout << ans << endl;
	return 0;
}