#include <bits/stdc++.h>

using namespace std;
vector<int>v[100005];
bool viz[100005];
void dfs(int node)
{
    viz[node]=1;
    for(auto x : v[node])
    {
        if(viz[x]==0)
            dfs(x);
    }
}
int main()
{
    ifstream cin("dfs.in");
    ofstream cout("dfs.out");

   int n,m,a,b;
   cin>>n>>m;
   for(int i=0;i<m;i++)
   {
       cin>>a>>b;
       v[a].push_back(b);
       v[b].push_back(a);
   }
   int comp=0;
   for(int i=1;i<=n;i++)
   {
       if(viz[i]==0)
       {
           dfs(i);
           comp++;
       }
   }
   cout<<comp;
    return 0;
}