#include<bits/stdc++.h>
using namespace std;
int  a[3001][3001];
bool v[3001];
vector<int> g[3001];
void dfs(int r,int d,int p)
{
	v[r]=true;
 
	if(d==2)
	{a[p][r]++;}
//	cout<<p<<r<<" ";}
	if(d==2)
	v[r]=false;
	//return ;}
	if(d<2)
	{
	for(int nn:g[r])
	{
		if(!v[nn])
		dfs(nn,d+1,p);
	}}
}
int main()
{
	int n,m;
	cin>>n>>m;
	for(int i=0;i<m;i++)
	{
		int a,b;
		cin>>a>>b;
		g[a].push_back(b);
	}
//	int a[n+1][m+1];
	for(int i=0;i<3001;i++)
	{
		for(int j=0;j<3001;j++)
		a[i][j]=0;
	}
	for(int i=1;i<=n;i++)
	{dfs(i,0,i);
//	cout<<"-";
//	v={false};
	memset(v,false,sizeof(v));
	}
	int c=0;
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n;j++)
		{if(a[i][j]==3)
		c++;
		a[j][i]=0;}
	}
 
	cout<<c<<"\n";
	return 0;
 
 
 
 
 
 
}

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