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#include <bits/stdc++.h>
using namespace std;
bool viz[100000];
vector <int> G[100000];
void DFS(int x)
{
viz[x]=1;
for (int i=0;i<G[x].size();i++) {
if (!viz[G[x][i]]) DFS(G[x][i]);
}
}
int main()
{
ifstream f("dfs.in");
ofstream g("dfs.out");
int N,M,nrcomp=0;
f>>N>>M;
for (int i=0;i<M;i++)
{
int x,y;
f>>x>>y;
G[x].push_back(y);
}
for (int i=1;i<=N;i++)
{
if (!viz[i]) {
nrcomp++;
DFS(i);
}
}
g<<nrcomp;
return 0;
}