#include <vector>
#include<fstream>
using namespace std;
int viz[200005],n,m,x,y,cont=1;
ifstream f("dfs.in");
ofstream g("dfs.out");
vector <int> A[100001];
    void citeste_graf()
      {
           int x,y,i;
           
             f>>n;
             
           while(f>>x>>y)
        
        {
              A[x].push_back(y);
              A[y].push_back(x);
        }
              
        f.close();
        
      }
 void df(int nod)
               { viz [nod]=1;
              
                  
                    int nr_vecini,i;
                       nr_vecini=A[nod].size();
                             for(i=0;i<nr_vecini;i++)
                                  if(viz[A[nod][i]]==0)
                                      df(A[nod][i]);
                        
               }
               

int main()
{
    
    ofstream g("dfs.out");
   
     citeste_graf();
     

  int i;
    for(i=1;i<=n;i++)
      if(viz[i]==0)
     { 
     cont++;
     df(i);
     }
     g<<cont;
     g.close();
  
    return 0;
    
}