"""

https://yukicoder.me/problems/no/182

"""

import sys

N = int(input())

if N == 1:
    print (1)
    sys.exit()

A = list(map(int,input().split()))

A.sort()

ans = 0

for i in range(N):
    if A[i-1] != A[i] and A[(i+1)%N] != A[i]:
        ans += 1

print (ans)