#include <bits/stdc++.h>
using namespace std;
set<long> grafo[100005];
void solve(){
long cont=0;
long n,q,a,b,sg;
cin>>n>>q;
while(q--)
{
cin>>a>>b;
grafo[a].insert(b);
}
for(long i=1;i<=n;i++)
{
if(!grafo[i].empty()){
cont+=grafo[i].size();
sg=*grafo[i].begin();
grafo[i].erase(grafo[i].begin());
for(auto x:grafo[i]) grafo[sg].insert(x);
}
grafo[i].clear();
}
cout<<cont;
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
solve();
}
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