#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}

int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	int n; cin >> n;
	int m; cin >> m;
	set<pair<int,int>> s;
	while(m--){
		int x,y; cin >> x >> y;
		s.insert({x,y});
	}
	int res=n*(n-1)*(n-2)/6;
	set<pair<int,int>> out;
	for(int i=1;i<=n;i++){
		for(int j=i+1;j<=n;j++){
			for(int k=j+1;k<=n;k++){
				int cnt=0;
				if(s.find({i,j})!=s.end())cnt++;
				if(s.find({i,k})!=s.end())cnt++;
				if(s.find({j,k})!=s.end())cnt++;
				if(cnt==2){
					if(s.find({i,j})==s.end())out.insert({i,j});
					if(s.find({i,k})==s.end())out.insert({i,k});
					if(s.find({j,k})==s.end())out.insert({j,k});
				}
			}
		}
	}
	for(int i=1;i<=n;i++){
		for(int j=i+1;j<=n;j++){
			for(int k=j+1;k<=n;k++){
				bool ok=1;
				if(out.find({i,j})!=out.end())ok=0;
				if(out.find({i,k})!=out.end())ok=0;
				if(out.find({j,k})!=out.end())ok=0;
				if(!ok)res--;
			}
		}
	}
	for(auto p:out){
		// cout << p.first << " " << p.second<< endl;
	}
	printf("%d\n",res );
}