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

int a[100][100],n,m,viz[100],cont;

int citire()
{
    fstream f;
    f.open("dfs.in",ios::in);
    int i,j,x,y;
    f>>n>>m;
    for(i=1;i<=m;i++)
    {
        f>>x>>y;
        a[x][y]=a[y][x]=1;
    }
/*
 for(i=1;i<=n;i++)
    {cout<<"\n";
        for(j=1;j<=m;j++){
        cout<<a[i][j]<<" ";}
    }
*/
}
int dfs(int nod)
{
int i;
viz[nod] = 1;
for (i=1;i<=n;i++)
if (!viz[i] && a[nod][i])
dfs(i);
}
int main()
{
    fstream g("dfs.out",ios::out);
    citire();
    int i;
    for (i = 1; i <= n; i++)
    if (!viz[i])
    { cont++;
    dfs(i);}
    g<<cont;
    return 0;
}