3 3
1 2
3 1
2 3
 2 0
 10 17
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
1 10
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
 2 1
1 2
 8 13
1 2
2 3
3 4
4 1
2 4
1 3
5 6
6 7
7 8
8 5
6 8
5 7
1 8
 3 2
1 2
2 3
 10 9
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
1 10
 10 40
1 3
2 6
9 10
4 6
1 2
1 8
6 10
3 6
1 4
5 7
3 8
3 9
4 5
3 7
8 9
5 9
5 6
2 3
3 4
1 6
4 8
3 10
5 10
2 8
2 10
4 7
1 10
1 7
4 10
5 8
8 10
7 9
6 8
2 7
4 9
6 9
7 8
6 7
1 5
2 9
 10 9
1 2
2 3
3 1
4 5
5 6
6 7
7 4
4 6
5 7
 1000000 0
 8 11
1 2
1 3
1 4
2 3
2 7
7 4
4 2
7 5
8 1
1 7
7 8
 9 9
1 2
2 3
3 1
4 5
5 6
6 4
7 8
8 9
9 7
 15 14
1 2
1 3
1 4
1 5
2 6
2 7
7 8
7 9
3 10
10 11
4 12
12 13
13 14
13 15
 10 17
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
1 10
2 3
2 4
2 5
2 6
2 7
2 8
2 9
2 10
 9 12
1 2
2 3
3 1
1 4
4 5
5 1
1 6
6 7
7 1
1 8
8 9
9 1
 3 1
1 2
 10 5
5 7
4 8
9 10
7 10
6 10
 15 15
1 2
1 3
1 4
1 5
2 6
2 7
7 8
7 9
3 10
10 11
4 12
12 13
13 14
13 15
15 1
 4 3
1 2
2 3
3 1
 10 30
4 9
4 6
1 2
8 10
7 8
4 7
1 8
6 7
5 6
1 5
7 9
1 7
8 9
7 10
9 10
3 9
2 7
5 7
5 9
2 8
2 9
5 8
3 10
1 6
3 6
2 10
6 8
3 4
2 5
4 5
 4 3
1 2
1 3
1 4
 4 6
1 2
2 3
3 4
4 1
1 3
2 4
 10 9
1 2
1 3
1 4
2 5
5 6
2 7
3 8
3 9
9 10
 10 10
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 1
 3 0
 6 6
1 2
2 3
3 1
4 5
5 6
6 4
 10 0
 9 15
1 2
2 3
3 1
1 4
4 5
5 1
1 6
6 7
7 1
1 8
8 9
9 1
2 9
7 4
2 8
 4 0
 1 0

1
 0
 43
 0
 8
 0
 84
 82
 63
 166666166667000000
 21
 30
 292
 64
 36
 0
 84
 284
 1
 37
 1
 4
 59
 50
 1
 2
 120
 28
 4
 0

import java.io.*;
import java.util.*;

public class Triangles {

	public static void main(String[] args) throws IOException {
		Kattio io = new Kattio(System.in);
		int n = io.getInt();
		int m = io.getInt();
		int[] occ = new int[n];
		if (n <= 2) {
			System.out.println(0);
			return;
		}
		long res = bin(n, 3);
		for (int i = 0; i < m; i++) {
			int a = io.getInt() - 1;
			int b = io.getInt() - 1;
			res -= n - 2;
			res += occ[a];
			res += occ[b];
			occ[b]++;
			occ[a]++;
		}
		System.out.println(res);
		io.close();
	}
	
	static long bin(long n, long k) {
		double res = 1;
		for (int i = 1; i <= k; i++) {
			res *= (n - i + 1);
			res /= i;
		}
		return (long) (res + 0.5d);
	}

	static class Kattio extends PrintWriter {
	    public Kattio(InputStream i) {
		super(new BufferedOutputStream(System.out));
		r = new BufferedReader(new InputStreamReader(i));
	    }
	    public Kattio(InputStream i, OutputStream o) {
		super(new BufferedOutputStream(o));
		r = new BufferedReader(new InputStreamReader(i));
	    }

	    public boolean hasMoreTokens() {
		return peekToken() != null;
	    }

	    public int getInt() {
		return Integer.parseInt(nextToken());
	    }

	    public double getDouble() { 
		return Double.parseDouble(nextToken());
	    }

	    public long getLong() {
		return Long.parseLong(nextToken());
	    }

	    public String getWord() {
		return nextToken();
	    }



	    private BufferedReader r;
	    private String line;
	    private StringTokenizer st;
	    private String token;

	    private String peekToken() {
		if (token == null) 
		    try {
			while (st == null || !st.hasMoreTokens()) {
			    line = r.readLine();
			    if (line == null) return null;
			    st = new StringTokenizer(line);
			}
			token = st.nextToken();
		    } catch (IOException e) { }
		return token;
	    }

	    private String nextToken() {
		String ans = peekToken();
		token = null;
		return ans;
	    }
	}

}
