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#include <fstream>
using namespace std;
ifstream f("ctc.in");
ofstream g("ctc.out");
struct el{int nod; int urm;};
el a[200001];
int l[100001],n,k,i,j,v1[100001],v2[100001],x,y,m;
bool viz[100001];
void ad(int x, int y)
{
k++;
a[k].nod=y;
a[k].urm=l[x];
l[x]=k;
}
int main()
{
f>>n>>m;
for(i=1;i<=m;i++)
{
f>>x>>y;
ad(x,y);
}
g<<sizeof a;
return 0;
}