#include<iostream>
#include<cstdio>
#include<fstream>
using namespace std;
int viz[69],n,vf,a[69][69],k,ok,cc,m,i,j;
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(a[nod][i]==1 && viz[i]==0)
            DFS(i);
}
int main()
{
  f>>n>>m;
  for(int k=1;k<=m;k++)
    {
        f>>i>>j;
        a[i][j]=1;
        a[j][i]=1;
    }
  for(int i=1;i<=n;i++)
    {
        if(viz[i]==0)
            {
                DFS(i);
                cc++;
            }
    }
    fprintf(g,"%d ",cc);
}