#include <fstream>
#include <vector>

using namespace std;

ifstream f("date.in");
ofstream g("date.out");

vector <int> G[101];

int n,m;

void read()
{
    f>>n>>m;
    int x,y;
    while(f>>x)
    {
        f>>y;
        G[x].push_back(y);
        G[y].push_back(x);
    }
}

int freq[101],s,freqmin[101];

void dfs(int nod,int nr)
{
    freq[nod]=nr;
    for(auto it: G[nod])
    {
        if(freq[it]==0)
            dfs(it,nr);
    }
}

int main()
{
    read();
    int nr=0;
    for(int i=1;i<=n;i++)
    {
        if(freq[i]==0)
        {
            nr++;
            dfs(i,nr);
        }
    }
    g<<nr<<'\n';
    /*
    for(int y=1;y<=nr;y++)
    {
        for(int i=1;i<=n;i++)
        {
            if(freq[i]==y)
                g<<i<<" ";
        }
        g<<'\n';
    }*/
    return 0;
}