import numpy as np
from scipy.sparse.csgraph import connected_components
from scipy.sparse import csr_matrix
n, m = map(int, input().split())
graph = [[0]*n for _ in range(n)]
for _ in range(m):
    a, b,c = map(int, input().split())
    graph[a-1][b-1] = 1
    graph[b-1][a-1] = 1  # 有向グラフなら消す# [[0, 1, 1, 0, 1], ..., [1, 0, 1, 1, 0]]

a = np.array(graph)

# <class 'numpy.ndarray'>

n, labels = connected_components(a)
print(n)