import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

n = I()
a = LI()

d = {}
ans = 0

for i in range(n):
    if a[i] in d:
        d[a[i]] += 1
        if d[a[i]] == 2:
            ans -= 1
    else:
        d[a[i]] = 1
        ans += 1

print(ans)