local n = io.read("*n")
local m = io.read("*n")
local friend = {}
local subfriend = {}
for i = 1, n - 1 do
  friend[i] = {}
  subfriend[i] = {}
  for j = i + 1, n do
    friend[i][j - i] = false
    subfriend[i][j - i] = false
  end
end
for i = 1, m do
  local a, b = io.read("*n", "*n")
  if b < a then a, b = b, a end
  friend[a][b - a] = 1
end

local ret = 0
for i = 1, n - 2 do
  for j = i + 1, n - 1 do
    for k = j + 1, n do
      if friend[i][j - i] and friend[j][k - j] and not friend[i][k - i] then
        subfriend[i][k - i] = true
      end
      if friend[i][j - i] and not friend[j][k - j] and friend[i][k - i] then
        subfriend[j][k - j] = true
      end
      if not friend[i][j - i] and friend[j][k - j] and friend[i][k - i] then
        subfriend[i][j - i] = true
      end
    end
  end
end
for i = 1, n - 2 do
  for j = i + 1, n - 1 do
    for k = j + 1, n do
      if not subfriend[i][j - i]
      and not subfriend[j][k - j]
      and not subfriend[i][k - i] then
        ret = ret + 1
      end
    end
  end
end
print(ret)