#include <bits/stdc++.h>

using namespace std;
long long n, a[200005], s = 0;
map < long long, int > mp;
int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        mp[a[i]]++;
    }
    for (int i = 1; i <= n; i++)
    {
        if (mp[a[i]] >= 1) s++;
        mp[a[i]] = 0;
    }
    cout << s;
    return 0;
}

# $\color{black}{\text{le}}$$\color{gray}{\text{duc}}$$\color{darkgray}{\text{trung}}$$\color{white}{\text{anh}}$