# include <iostream>
# include <fstream>
using namespace std;
fstream f("dfs.in",ios::in);
fstream g("dfs.out",ios::out);
int n,m,i,k,a[10000][10000],viz[10000],nc,x,y;
void df(int k)
{
    int i;
    viz[k]=1;

    for(i=1;i<=n;i++)
        if (a[k][i]==1 && viz[i]==0) df(i);
}
int main()
{
    f>>n>>m;cout<<n<<m;
    for (i=1;i<=m;i++)
    {
        f>>x>>y;
        a[x][y]=a[y][x]=1;
    }
    f.close();
    for (i=1;i<=n;i++)
      {  if (viz[i]==0)
        {
            nc++;
            df(i);
        }}
    g<<nc;
    g.close();
    return 0;
}