import java.util.*;
 
public class Main {
    public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = Integer.parseInt(sc.next());
    	int[] d = new int[n];
    	for(int i=0; i<n; i++) {
    	    d[i] = Integer.parseInt(sc.next());
    	}
    	Arrays.sort(d);
    	int count = 1;
    	for(int i=1; i<n; i++) {
    	    if(d[i] > d[i-1]) count++;
    	}
    	System.out.println(count);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = Integer.parseInt(sc.next());
    	int[] d = new int[n];
    	for(int i=0; i<n; i++) {
    	    d[i] = Integer.parseInt(sc.next());
    	}
    	Arrays.sort(d);
    	int count = 1;
    	for(int i=1; i<n; i++) {
    	    if(d[i] > d[i-1]) count++;
    	}
    	System.out.println(count);
    }
} Main public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = Integer.parseInt(sc.next());
    	int[] d = new int[n];
    	for(int i=0; i<n; i++) {
    	    d[i] = Integer.parseInt(sc.next());
    	}
    	Arrays.sort(d);
    	int count = 1;
    	for(int i=1; i<n; i++) {
    	    if(d[i] > d[i-1]) count++;
    	}
    	System.out.println(count);
    } main {
    	Scanner sc = new Scanner(System.in);
    	int n = Integer.parseInt(sc.next());
    	int[] d = new int[n];
    	for(int i=0; i<n; i++) {
    	    d[i] = Integer.parseInt(sc.next());
    	}
    	Arrays.sort(d);
    	int count = 1;
    	for(int i=1; i<n; i++) {
    	    if(d[i] > d[i-1]) count++;
    	}
    	System.out.println(count);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = Integer.parseInt(sc.next()); n Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int[] d = new int[n]; d new int[n] n for(int i=0; i<n; i++) {
    	    d[i] = Integer.parseInt(sc.next());
    	} int i=0; int i=0; i 0 i<n i n i++ i++ i {
    	    d[i] = Integer.parseInt(sc.next());
    	} {
    	    d[i] = Integer.parseInt(sc.next());
    	} d[i] = Integer.parseInt(sc.next()) d[i] d i Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc Arrays.sort(d) Arrays.sort Arrays d int count = 1; count 1 for(int i=1; i<n; i++) {
    	    if(d[i] > d[i-1]) count++;
    	} int i=1; int i=1; i 1 i<n i n i++ i++ i {
    	    if(d[i] > d[i-1]) count++;
    	} {
    	    if(d[i] > d[i-1]) count++;
    	} if(d[i] > d[i-1]) count++; d[i] > d[i-1] d[i] d i d[i-1] d i-1 i 1 count++ count System.out.println(count) System.out.println System.out System System.out count String[] args args public class Main {
    public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = Integer.parseInt(sc.next());
    	int[] d = new int[n];
    	for(int i=0; i<n; i++) {
    	    d[i] = Integer.parseInt(sc.next());
    	}
    	Arrays.sort(d);
    	int count = 1;
    	for(int i=1; i<n; i++) {
    	    if(d[i] > d[i-1]) count++;
    	}
    	System.out.println(count);
    }
} public class Main {
    public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = Integer.parseInt(sc.next());
    	int[] d = new int[n];
    	for(int i=0; i<n; i++) {
    	    d[i] = Integer.parseInt(sc.next());
    	}
    	Arrays.sort(d);
    	int count = 1;
    	for(int i=1; i<n; i++) {
    	    if(d[i] > d[i-1]) count++;
    	}
    	System.out.println(count);
    }
} Main
import java.util.*;
 
public class Main {
    public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = Integer.parseInt(sc.next());
    	int[] d = new int[n];
    	for(int i=0; i<n; i++) {
    	    d[i] = Integer.parseInt(sc.next());
    	}
    	Arrays.sort(d);
    	int count = 1;
    	for(int i=1; i<n; i++) {
    	    if(d[i] > d[i-1]) count++;
    	}
    	System.out.println(count);
    }
}