import java.util.Arrays; import java.util.Scanner; public class Main_yukicoder182 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int[] a = new int[n]; for (int i = 0; i < n; i++) { a[i] = sc.nextInt(); } Arrays.sort(a); int ret = 0; for (int i = 0; i < n; i++) { if (i == 0 && a[i] != a[i + 1]) { ret++; } else if (i == n - 1 && a[i] != a[i - 1]) { ret++; } else if (i > 0 && i < n - 1 && a[i] != a[i - 1] && a[i] != a[i + 1]) { ret++; } } System.out.println(ret); sc.close(); } }