#include<stdio.h>
#include<stdlib.h>
#define NMAX 100000
typedef struct Node{int info; struct Node *next;}Node;
Node *G[NMAX+1];

int viz[NMAX+1];
unsigned long n,m;

void citire()
{
FILE *inf;
inf=fopen("dfs.in","r");
unsigned long i,z,y;
fscanf(inf,"%ldu %ldu",&n,&m);
for(i=1;i<=m;i++)
 {
  fscanf(inf,"%ldu %ldu",&z,&y);
  Node *p;
  if(!(p=(Node*)malloc(sizeof(Node)))) return ;
  p->info=y;
  p->next=G[z];
  G[z]=p;
 }
 fclose(inf);
}

void Dfs(unsigned long x)
{
Node *p;
viz[x]=1;
for(p=G[x];p;p=p->next)
      if(!viz[p->info])
      {
      viz[p->info]=1;
      Dfs(p->info);
      }     
}


int main()
{
long i,nrcomp;
citire();
nrcomp=0;

for(i=1;i<=n;i++)
    if(viz[i]==0) { nrcomp++; Dfs(i); }

FILE *outf;
outf=fopen("dfs.out","w");
fprintf(outf,"Numarul componentelor conexe este: %ld ",nrcomp);
fclose(outf);
return 0;    
}