#include <cstdio>
#include <vector>

using namespace std;
#define Nmax 100005
vector <int> ad[Nmax] ;
bool viz[Nmax] ;
int n , m , cnt , a , b ;

void dfs ( int nod )
{
    if ( viz[nod] ) return ;
    viz[nod] = true ;
    for ( int i = 0 ; i < ad[nod].size() ; i++ )
    {
        dfs(ad[nod][i]) ;
    }
}

int main()
{
    freopen("dfs.in","r",stdin);
    freopen("dfs.out","w",stdout);

    scanf("%d %d",&n,&m);
    for ( int i = 1 ; i <= m ; i++ )
    {
        scanf("%d %d",&a,&b);
        ad[a].push_back(b) ;
        ad[b].push_back(a) ;
    }
    for  (int i = 1 ; i <= n ; i++ )
    {
        if ( viz[i]==false )
        {
            dfs(i);
            cnt++;
        }
    }
    printf("%d ",cnt);
}