import java.util.Scanner;
import java.util.Arrays;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		
		Arrays.sort(d);
		
		int cnt = 0;
		int prev = 0;
		for (int i : d) {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		}
		
		System.out.println(cnt);
	}
} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		
		Arrays.sort(d);
		
		int cnt = 0;
		int prev = 0;
		for (int i : d) {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		}
		
		System.out.println(cnt);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		
		Arrays.sort(d);
		
		int cnt = 0;
		int prev = 0;
		for (int i : d) {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		}
		
		System.out.println(cnt);
	} main {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		
		Arrays.sort(d);
		
		int cnt = 0;
		int prev = 0;
		for (int i : d) {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		}
		
		System.out.println(cnt);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int[] d = new int[N]; d new int[N] N for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			d[i] = sc.nextInt();
		} {
			d[i] = sc.nextInt();
		} d[i] = sc.nextInt() d[i] d i sc.nextInt() sc.nextInt sc Arrays.sort(d) Arrays.sort Arrays d int cnt = 0; cnt 0 int prev = 0; prev 0 for (int i : d) {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		} int i d {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		} {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		} if (prev < i) {
				cnt++;
			} prev < i prev i {
				cnt++;
			} cnt++ cnt prev = i prev i System.out.println(cnt) System.out.println System.out System System.out cnt String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		
		Arrays.sort(d);
		
		int cnt = 0;
		int prev = 0;
		for (int i : d) {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		}
		
		System.out.println(cnt);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		
		Arrays.sort(d);
		
		int cnt = 0;
		int prev = 0;
		for (int i : d) {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		}
		
		System.out.println(cnt);
	}
} Main
import java.util.Scanner;
import java.util.Arrays;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		
		Arrays.sort(d);
		
		int cnt = 0;
		int prev = 0;
		for (int i : d) {
			if (prev < i) {
				cnt++;
			}
			prev = i;
		}
		
		System.out.println(cnt);
	}
}
