#include <bits/stdc++.h>
#include <fstream>

using namespace std;
ifstream f("dfs.in");
ofstream g("dfs.out");
vector<int>[1000001]
bool viz[10000001];
void dfs(int nod)
{
    int q;
    viz[nod]=1;
    for(int i=0;i<v[nod].size();i++)
    {
        if(viz[[nod][i]]==0){
            dfs(v[nod][i])
        }
    }
}
int main()
{int n , m , x,y;
    for(i=1;i<=m;i++){
        int x, y;
    v[x].push_back(y);
    v[y].push_back(x);
    }
    for(i=1;i<=n;i+++)
    {
        if(viz[i]==0)
        {
            dfs(i);
            comp++;
        }
    }
    g<<comp;

    return 0;
}