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):
        print("c")
        for e in range(i+1,num-1):
            if li[i]==li[e]:continue
            count+=len([p for p,q in enumerate(li[e+1:]) if (li[i]-li[e])*(li[p+e+1]-li[e])*abs(li[i]-li[p+e+1])>0])

    return count
print(ret(n,a))