#input of int(split by space)
def get_i()
  return gets.chomp.split(" ").map(&:to_i)
end
#input of float(split by space)
def get_f()
  return gets.chomp.split(" ").map(&:to_f)
end
#input of string(split by space)
def get()
  return gets.chomp.split(" ")
end
#input of string(split per one character)
def get_nsp()
  return gets.chomp.split("")
end
#yes or no decision
def yn_judge(bool,y="Yes",n="No")
  return bool ? y : n 
end
#create of array
def array(size1,init=nil,size2=-1)
  if size2==-1
      return Array.new(size1){init}
  else
      return Array.new(size2){Array.new(size1){init}}
  end
end

def max(a,b)
    return a>b ? a : b
end

def min(a,b)
    return a>b ? b : a
end

INF=Float::INFINITY

N=gets.to_i
L=get_i
ans=0
(N-2).times do|i|
    (i+1).upto(N-2) do|j|
        next if L[i]==L[j]
        (j+1).upto(N-1) do|k|
            next if L[j]==L[k] or L[i]==L[k]
            ans+=1  if L[i]+L[j]>L[k] and L[j]+L[k]>L[i] and L[k]+L[i]>L[j]
        end
    end
end
puts ans