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#include <iostream>
#include <fstream>
#include <vector>
#define MAX 50005
using namespace std;
ifstream f("dfs.in");
ofstream g("dfs.out");
int nrnod, nrmuchii;
bool viz[MAX];
vector<int> v[MAX];
void dfs(int x)
{
viz[x]=true;
for(int i=0; i<v[x].size(); i++)
if(!viz[v[x][i]])
dfs(v[x][i]);
}
int main(){
int comp=0, x, y;
f>>nrnod>>nrmuchii;
for(int i=1; i<=nrmuchii; i++)
{
f>>x>>y;
v[x].push_back(y);
v[y].push_back(x);
}
for(int i=1; i<=nrnod;i++)
if(!viz[i])
dfs(i);
comp++;
g<<comp<< " ";
return 0;
}