#include <iostream>
#include <vector>
using namespace std;
#define rep(i,n) for(int i = 0; i < (n); i++)
#define rep2(i,n) for(int i = 1; i <= (n); i++)

int main(){
    int cnt = 0;
    vector<int>v(1000000,0);

    int n = 0; cin >> n;
    vector<int>a(n,0);

    rep(i,n){ cin >> a[i]; }
    rep(i,n){ v[a[i]] += 1; }
    rep2(i,n){ if(v[i] == 1){cnt+=1;} }

    cout << cnt << endl;
    return 0;
}