N, M = gets.split.map(&:to_i)

edges = []

edges = [*1..N].map{
    p1, p2 = gets.split.map(&:to_i)
    if p1 < p2 then
        [p1, p2]
    else
        [p2, p1]
    end
}.sort_by{|p| p[0]}

n_cross = 0

for i in 0...edges.size do
    car_path = edges[i]
    for j in i...edges.size do
        from, to = edges[j]
        if car_path[0] < from && from < car_path[1] &&
            (to < car_path[0] || car_path[1] < to) then
                n_cross += 1
        end
    end
end

p n_cross