func main()
	var n: int :: cui@inputInt()
	var m: int :: cui@inputInt()
	var data: [][]bool :: #[n, n]bool
	var dic: dict<int, bool> :: #dict<int, bool>
	var dic2: dict<int, bool> :: #dict<int, bool>
	for(1, m)
		var a: int :: cui@inputInt()
		var b: int :: cui@inputInt()
		do a :- 1
		do b :- 1
		do data[a][b] :: true
		do data[b][a] :: true
		do dic.add(a * n + b, true)
		do dic.add(b * n + a, true)
	end for
	for i(0, n - 1)
		for j(0, n - 1)
			if(!data[i][j])
				skip j
			end if
			; iとjは友達
			for k(0, n - 1)
				if(!data[j][k])
					skip k
				end if
				; jとkは友達
				
				if(!data[i][k])
					; iとkは友達の友達だが友達ではない
					do dic2.add(i * n + k, true)
					do dic2.add(k * n + i, true)
				end if
			end for
		end for
	end for
	
	var ans: int :: 0
	for i(0, n - 1)
		for j(i + 1, n - 1)
			if(dic2.get(i * n + j, &))
				skip j
			end if
			for k(j + 1, n - 1)
				if(dic2.get(i * n + k, &))
					skip k
				end if
				if(dic2.get(j * n + k, &))
					skip k
				end if
				do ans :+ 1
			end for
		end for
	end for
	do cui@print("\{ans}\n")
end func