#include <bits/stdc++.h>

using namespace std;
vector<int>v[100005];
bool viz[100005];
void dfs(int x)
{
    viz[x]=1;
    for(auto i : v[x])
    {
        if(viz[i]==0)
            dfs(i);
    }
}
int main()
{
    ifstream cin("dfs.in");
    ofstream cout("dfs.out");
    int n,m,x,y;
    cin>>n>>m;
    for(int i=0;i<m;i++)
    {
        cin>>x>>y;
        v[x].push_back(y);
        v[y].push_back(x);
    }
    int componente=0;
    for(int i=1;i<=n;i++)
    {
        if(viz[i]==0)
        {
            componente++;
            dfs(i);
        }
    }
    cout<<componente;
    return 0;
}