#include<stdio.h>

typedef struct nod { int info;
                     nod *next;} pnod;
pnod *G[100005];
int viz[100005];
int n,m,conex, i,x,y;

void DFs(int nod)
{pnod *a;
viz[nod]=1;    
a=G[nod];
while (a!=NULL)
    {if (viz[a->info]==0) DFs(a->info);
    a=a->next;
}
}

int main() 
{ pnod*a;  
FILE* f=fopen("dfs.in", "r");
fscanf (f,"%d %d", &n,&m);
for (i=1;i<=m;i++) {
       fscanf(f,"%d %d", &x, &y);
       a=new nod;
       a->info=y;
       a->next=G[x];
       G[x]=a; 
       
       a=new nod;
       a->info=x;
       a->next=G[y];
       G[y]=a;
       }
           
for (i=1;i<=n;i++)
    if (viz[i]==0)  {
                    conex++; 
                    DFs(i);}
FILE* g=fopen("dfs.out", "w+");
fprintf (g,"componente conexe %d\n",conex);
fclose(f);
fclose(g);
return 0;
}