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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
#define NMax 100000
vector <int> a[NMax];
bool uz[100005];
int n;
ifstream fin("dfs.in");
ofstream fout("dfs.out");
void Citire()
{
int x, y;
fin >> n;
while(fin >> x >> y)
{
a[x].push_back(y);
a[y].push_back(x);
}
}
void DFS(int x)
{
uz[x] = 1;
for(int i = 0; i < a[x].size(); i++)
if(!uz[a[x][i]]) DFS(a[x][i]);
}
void Parcurgere()
{
int total = 0;
for(int i = 1; i <= n; i++)
if(uz[i] == 0)
{
total++;
DFS(i);
}
fout << total;
}
int main()
{
Citire();
Parcurgere();
return 0;
}