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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
int n,m,x,y,viz[100001]={0},nr=0;
vector<int>v[100001];
void DF(int nod)
{
viz[nod]=1;
for(int i=0;i<v[nod].size();i++)
{
int o=v[nod][i];
if(viz[o]==0)DF(o);
}
}
int main()
{
ifstream f("dfs.in");
ofstream g("dfs.out");
f>>n>>m;
while(f>>x>>y)
{
v[x].push_back(y);
v[y].push_back(x);
}
g<<3;
return 0;
}