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: Accepted)

using System;
using System.Linq;

namespace kozaiyApp
{
    public class KagamiMochi
    {
        static void Main()
        {
            int ans = 0;
            int N = int.Parse(Console.ReadLine());
            int[] d = new int[N];
            int[] Mochi = Enumerable.Repeat<int>(1000, N).ToArray();

            for (int i = 0; i < N; i++)
            {
                d[i] = int.Parse(Console.ReadLine());
            }
            Array.Sort(d);

            for (int i = 0; i < N; i++)
            {
                if (0 > Array.BinarySearch(Mochi, d[i]))
                {
                    int index = Array.IndexOf(Mochi, 1000);
                    Mochi[index] = d[i];
                }
            }

            
            if (0 > Array.IndexOf(Mochi, 1000))
            {
                ans = d.Length;
            }
            else
            {
                ans = Array.IndexOf(Mochi, 1000);
            }

            Console.WriteLine(ans);
        }
    }
}