# require "template"
lib C
  fun strtoll(s : UInt8*, p : UInt8**, b : Int32) : Int64
end

class String
  def to_i64
    C.strtoll(self, nil, 10)
  end
end

n = read_line.to_i64
a = read_line.split.map(&.to_i).chunk &.itself
k = 0i64
a.each do |i|
  if i[0] > 0
    p = i[1].size.to_i64
    k += p*(p + 1)//2
  end
end
puts n*(n + 1)//2 - k