#include <iostream>

#include <fstream>

#include <vector>

using namespace std;

ifstream fin("dfs.in");

ofstream fout("dfs.out");

vector<vector<int>>G;

vector<bool>v;

int n,m;

void citeste()

{

int x,y;

fin>>n>>m;

G=vector<vector<int>>(n+1);

v=vector<bool>(n+1);

for(int i=1; i<=m; i++)

{

fin>>x>>y;

G[x].push_back(y);

G[y].push_back(x);

}

}

void DFS(int x)

{

v[x]=1;

for(auto i:G[x])

if(!v[i])

DFS(i);

}

int main()

{

int nr=0;

read();

for(int i=1; i<=n; i++)

{

if(!v[i])

{

nr++;

DFS(i);

}

}

fout<<nr;

}