#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("DFS.in");
ofstream fout("DFS.out");
int viz[101],a[101][101],n,m,x,cmp;
void DFS(int k)
{
    viz[k]=1;
        for(int j=1; j<=n; j++)
        {
            if(a[k][j]==1&&viz[j]==0)
            {
                DFS(j);

            }
        }

}
void citire()
{
    int v,b;
    fin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        fin>>v>>b;
        a[v][b]=1;
        a[b][v]=1;
    }
    for(int i=1; i<=n; i++){
       if(viz[i]==0){
        cmp++;
        DFS(i);
       }
    }
}






int main()
{
    citire();
    fout<<cmp;
}