import java.util.*;

public class Run {
    public static void main (String arg[]) {
        Scanner scan = new Scanner(System.in);
        int N = scan.nextInt();
        int ans = N;
        int A;
        HashMap<Integer, Integer> M = new HashMap<>();
        for (int i = 0; i < N; i++) {
            A = scan.nextInt();
            if (!M.containsKey(A)) M.put(A, 1);
            else {
                if (M.get(A)==1) {
                    ans-=2;
                    M.put(A, 2);
                }
                else ans--;
            }
        }
        System.out.println(ans);
    }
}