#include <stdio.h>
#include <stdlib.h>

typedef struct {
	int *par, *size;
} UF_forest;

void UF_init(UF_forest *F, int n)
{
	int i;
	F->par = (int*)malloc(sizeof(int) * (n + 1));
	F->size = (int*)malloc(sizeof(int) * (n + 1));
	for (i = 1; i <= n; i++) {
		F->par[i] = i;
		F->size[i] = 1;
	}
}

int UF_root(UF_forest *F, int v)
{
	if (F->par[v] == v) return v;
	else {
		F->par[v] = UF_root(F, F->par[v]);
		return F->par[v];
	}
}

void UF_merge(UF_forest *F, int u, int v)
{
	u = UF_root(F, u);
	v = UF_root(F, v);
	if (u == v) return;
	else if (F->size[u] > F->size[v]) {
		F->par[v] = u;
		F->size[u] += F->size[v];
	} else {
		F->par[u] = v;
		F->size[v] += F->size[u];
	}
}

int main()
{
	int i, N, M, u, w, c;
	UF_forest F;
	scanf("%d %d", &N, &M);
	UF_init(&F, N);
	for (i = 1; i <= M; i++) {
		scanf("%d %d %d", &u, &w, &c);
		UF_merge(&F, u, w);
	}
	
	int ans = 0;
	for (u = 1; u <= N; u++) if (UF_root(&F, u) == u) ans++;
	printf("%d\n", ans);
	fflush(stdout);
	return 0;
}