N = int(input())
a = [0]
a.extend(list(map(int, input().split())))
a.sort()
a.append(10**12)
i = 0
ans = 0
if N == 1:
    ans = 1
else:
    for i in range(1, N+1):
        if a[i-1] < a[i] < a[i+1]:
            ans += 1
print(ans)