Problem:
Score : 200 points

Problem Statement

An X-layered kagami mochi (X ≥ 1) is a pile of X round mochi (rice cake) stacked vertically where each mochi (except the bottom one) has a smaller diameter than that of the mochi directly below it. For example, if you stack three mochi with diameters of 10, 8 and 6 centimeters from bottom to top in this order, you have a 3-layered kagami mochi; if you put just one mochi, you have a 1-layered kagami mochi.

Lunlun the dachshund has N round mochi, and the diameter of the i-th mochi is d_i centimeters. When we make a kagami mochi using some or all of them, at most how many layers can our kagami mochi have?

Constraints

1 ≤ N ≤ 100

1 ≤ d_i ≤ 100

All input values are integers.

Input

Input is given from Standard Input in the following format:

N
d_1
:
d_N

Output

Print the maximum number of layers in a kagami mochi that can be made.

Sample Input 1

4
10
8
8
6

Sample Output 1

3

If we stack the mochi with diameters of 10, 8 and 6 centimeters from bottom to top in this order, we have a 3-layered kagami mochi, which is the maximum number of layers.

Sample Input 2

3
15
15
15

Sample Output 2

1

When all the mochi have the same diameter, we can only have a 1-layered kagami mochi.

Sample Input 3

7
50
30
50
100
50
80
30

Sample Output 3

4

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

 using System;
 public class Hello{
     static void sort(int[] x){
         for(int i = 0; i < x.Length - 1;i++){
             if(x[i] < x[i + 1]){
                 int temp = x[i];
                 x[i] = x[i + 1];
                 x[i + 1] = temp;
             }
         }
     }
    public static void Main(){
        int N = int.Parse(Console.ReadLine());
        int[] mochi = new int[N];
        for(int x = 0;x < N;x++){
            mochi[x] = int.Parse(Console.ReadLine());
        }
        sort(mochi);
        int count = 1;
        for(int j = 0;j < mochi.Length - 1;j++){
            if(mochi[j] > mochi[j + 1]){
                count++;
            }
        }
        
        Console.WriteLine(count);
    }
}