n=int(input())
a=[int(i) for i in input().split(" ")]
def ret(num,li):
    count=0
    if num<3:return count
    for i in range(num-2):
        for e in range(i+1,num-1):
            for p in range(e+1,num):
                if (li[i]-li[e])*(li[p]-li[e])*abs(li[i]-li[p])>0:
                    count+=1
    return count
print(ret(n,a))