#include<iostream>
#include<vector>

#define REP(i,n) for(i=0; i<n; i++)

using namespace std;

int search(vector<int> v) {
    int i,j,count=0,flag=1;
    REP(i,v.size()) {
        REP(j,v.size()) {
            if(i==j) { continue; }
            if(v[i]==v[j]) {
                flag=0;
                break;
            }
        }
        if(flag>0) { count++; }
        else { flag=1; }
    }
    return count;
}

int main()
{
    int n;
    cin>>n;
    vector<int> v(n);
    int num,i;
    REP(i,n){
        cin>>num;
        v[i]=num;
    }
    cout << (search(v)) << endl;
    return 0;
}