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# Uses python3
import sys
def explore(adj, visited, v):
visited.append(v)
for i in adj[v]:
if i not in visited:
explore(adj, visited, i)
def number_of_components(adj):
visited = []
cc = 0
for v in range(len(adj)):
if v not in visited:
explore(adj, visited, v)
cc = cc + 1
return cc
if __name__ == '__main__':
input = sys.stdin.read()
data = list(map(int, input.split()))
n, m = data[0:2]
data = data[2:]
edges = list(zip(data[0:(2 * m):2], data[1:(2 * m):2]))
adj = [[] for _ in range(n)]
for (a, b) in edges:
adj[a - 1].append(b - 1)
adj[b - 1].append(a - 1)
print(number_of_components(adj))
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