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#include <bits/stdc++.h>
#include <fstream>
using namespace std;
int viz[100005],n,m;
ifstream f("dfs.in");
ofstream g("dfs.out");
int conexe;
vector < int > v[100005];
void dfs(int nod)
{
viz[nod]=1;
vector <int > ::iterator it;
for(it=v[nod].begin();it!=v[nod].end();++it)
{
int nou=*it;
if(viz[nou]==0)
dfs(nou);
}
}
int main()
{
int a,b;
f>>n>>m;
for(int i=1;i<=m;i++)
{
f>>a>>b;
v[a].push_back(b);
v[b].push_back(a);
}
dfs(1);
for(int i=1;i<=n;i++)
if(viz[i]) conexe++;
g<<conexe<<'\n';
return 0;
}