import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.List;
import java.util.stream.Stream;
import java.util.Collection;
import java.util.Scanner;
import java.util.ArrayList;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BKagamiMochi solver = new BKagamiMochi();
        solver.solve(1, in, out);
        out.close();
    }

    static class BKagamiMochi {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            List<Integer> l = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            }
            long ans = l.stream().sorted().distinct().count();
            out.println(ans);
        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.List; List java.util import java.util.stream.Stream; Stream java.util.stream import java.util.Collection; Collection java.util import java.util.Scanner; Scanner java.util import java.util.ArrayList; ArrayList java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BKagamiMochi solver = new BKagamiMochi();
        solver.solve(1, in, out);
        out.close();
    }

    static class BKagamiMochi {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            List<Integer> l = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            }
            long ans = l.stream().sorted().distinct().count();
            out.println(ans);
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BKagamiMochi solver = new BKagamiMochi();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BKagamiMochi solver = new BKagamiMochi();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) BKagamiMochi solver = new BKagamiMochi(); solver new BKagamiMochi() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class BKagamiMochi {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            List<Integer> l = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            }
            long ans = l.stream().sorted().distinct().count();
            out.println(ans);
        }

    } BKagamiMochi public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            List<Integer> l = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            }
            long ans = l.stream().sorted().distinct().count();
            out.println(ans);
        } solve {
            int n = Integer.parseInt(in.next());
            List<Integer> l = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            }
            long ans = l.stream().sorted().distinct().count();
            out.println(ans);
        } int n = Integer.parseInt(in.next()); n Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in List<Integer> l = new ArrayList<>(); l new ArrayList<>() for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
                l.add(Integer.parseInt(in.next()));
            } {
                l.add(Integer.parseInt(in.next()));
            } l.add(Integer.parseInt(in.next())) l.add l Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in long ans = l.stream().sorted().distinct().count(); ans l.stream().sorted().distinct().count() l.stream().sorted().distinct().count l.stream().sorted().distinct() l.stream().sorted().distinct l.stream().sorted() l.stream().sorted l.stream() l.stream l out.println(ans) out.println out ans int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BKagamiMochi solver = new BKagamiMochi();
        solver.solve(1, in, out);
        out.close();
    }

    static class BKagamiMochi {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            List<Integer> l = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            }
            long ans = l.stream().sorted().distinct().count();
            out.println(ans);
        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BKagamiMochi solver = new BKagamiMochi();
        solver.solve(1, in, out);
        out.close();
    }

    static class BKagamiMochi {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            List<Integer> l = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            }
            long ans = l.stream().sorted().distinct().count();
            out.println(ans);
        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.List;
import java.util.stream.Stream;
import java.util.Collection;
import java.util.Scanner;
import java.util.ArrayList;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BKagamiMochi solver = new BKagamiMochi();
        solver.solve(1, in, out);
        out.close();
    }

    static class BKagamiMochi {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            List<Integer> l = new ArrayList<>();
            for (int i = 0; i < n; i++) {
                l.add(Integer.parseInt(in.next()));
            }
            long ans = l.stream().sorted().distinct().count();
            out.println(ans);
        }

    }
}

