N = input()
Alist = []
Alist = map(int, raw_input().split())
Alist.sort()
cnt = 0
if N != 1:
    for i in range(1, N-1):
        if Alist[i-1] != Alist[i] and Alist[i] != Alist[i+1]:
            cnt = cnt + 1
    if Alist[0] != Alist[1]:
        cnt += 1
    if Alist[N-2] != Alist[N-1]:
        cnt += 1
    print cnt
else:
    print 1