#include<cstdio>
#include<vector>

using namespace std;
void read(),solve(),df(int nod);
int n,m,a,b,viz[305],nr,i;
vector<int> v[310];
int main()
{
	read();
	solve();
	return 0;
}
void read()
{
	freopen("dfs.in","r",stdin);
	freopen("dfs.out","w",stdout);
	scanf("%d%d",&n,&m);
	for(;m;m--)
	{
		scanf("%d%d",&a,&b);
		v[a].push_back(b);
		v[b].push_back(a);
	}
}
void solve()
{
	for(i=1;i<=n;i++)
		if(!viz[i])
		{
			nr++;
			df(i);
		}
	printf("%d",nr);
}
void df(int nod)
{
	vector<int>::iterator it;
	viz[nod]=1;
	for(it=v[nod].begin();it!=v[nod].end();it++)
		if(!viz[*it])
			df(*it);
}