#include <bits/stdc++.h>
using namespace std;
#define LMAX 100005
int n;
bool viz[LMAX];
vector<int> G[LMAX];
void dfs(int nod){
    viz[nod]=1;
    for(auto it : G[nod])
        if(!viz[it])
            dfs(it);
}
int main(){
    freopen("dfs.in","r",stdin);
    freopen("dfs.out","w",stdout);
    int m;
    scanf("%d %d",&n,&m);
    for(int i=1;i<=m;++i){
        int from,to;
        scanf("%d %d",&from,&to);
        G[from].push_back(to);
        G[to].push_back(from);
    }
    int nr_comp=0;
    for(int i=1;i<=n;++i)
        if(!viz[i]){
            ++nr_comp;
            dfs(i);
        }
    printf("%d\n",nr_comp);
    return 0;
}