#include<iostream>
#include<cstdio>
#include<fstream>
#include<vector>
using namespace std;
int viz[100001],n,cc,m,i,j;
vector <int> vec[100001];
ifstream f("dfs.in");
FILE * g=fopen("dfs.out","w");
void DFS(int nod)
{
    viz[nod]=1;
    for(int i=1;i<=n;i++)
        if(vec[nod][i]==1 && viz[i]==0)
            DFS(i);
}
int main()
{
  f>>n>>m;
  for(int k=1;k<=m;k++)
    {
        f>>i>>j;
        vec[i].push_back(j);
        vec[j].push_back(i);
    }
  for(int i=1;i<=n;i++)
    {
        if(viz[i]==0)
            {
                DFS(i);
                cc++;
            }
    }
    fprintf(g,"%d ",cc);
}