#include <iostream>
#include <fstream>
using namespace std;

ifstream fin ("bazine.in");
ofstream fout ("bazine.out");


int n, viz[101], a[101][101], m, X, NrC;

void citire()
{
    int x , y;
    fin >> n >> m;
    while (fin >> x >> y)
    {
        a[x][y]=a[y][x]=1;
    }
}

void Dfs(int nod)
{
    viz[nod]=NrC;
    for (int i=1; i<=n; i++)
    {
        if (a[nod][i]==1 and !viz[i])
            Dfs(i);
    }

}
void compcon()
{
    for (int i=1; i<=n; i++)
    {
        if (viz[i]==0)
        {
            NrC++;
            Dfs(i);
        }
    }
    fout << NrC;
}

int main()
{
    citire();
    compcon();
    return 0;
}