#include<fstream>
using namespace std;

 int V[1000],n,m,M[1000][1000];
 ifstream f("dfs.in");
 ofstream g("dfs.out");
int x,y,plec,nr;
void citesc()
{
    f>>n>>m;
  int i;
 for(i = 1;i<=m;++i)
 {
     f>>x>>y;
     M[x][y] = M[y][x] = 1;
     }
}

int df(int nod)
{
    int i;
 V[nod] = 1;
++nr;

 for(i = 1;i<=n;++i)
 if(!V[i] && M[nod][i])

    df(i);
}

int main()
{
    citesc();
  int i;
for(i = 1;i<=n;++i)
if(!V[i])
df(i);
g<<nr;
f.close();
g.close();
return 0;
}