#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using PII = std::pair<int, int>;
using PLL = std::pair<ll, ll>;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)


int main()
{

#ifdef DEBUG
    cout << "DEBUG MODE" << endl;
    ifstream in("input.txt"); //for debug
    cin.rdbuf(in.rdbuf());    //for debug
#endif

    int n, x, c, ans;
    map<int, int> m;
    cin >> n;
    rep(i, n)
    {
        cin >> x;
        if (m[x] == 0)
            m[x] = 1;
        else
            m[x] += 1;
    }

    ans = 0;
    for (auto z : m)
        if (z.second == 1)
            ans++;
    cout << ans << endl;

    return 0;
}