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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
#include<string.h>
int main()
{
    char str[100];
    int rank[100];
    int n,m,w,c=0;
    scanf("%d",&n);
    for(int i=0;i<n;i++)
    {
    scanf("%s",&str[i]);
    }
    for(int i=n-1;i>0;i--)
    {
        for(int j=0;j<n-2;j++)
        {
            if(str[j]>str[j+1])
            {
                w=str[j];
                str[j]=str[j+1];
                str[j+1]=w;
            }
        }
    }
    rank[0]=str[0];
    for(int i=1;i<n;i++)
    {
        if(str[i]!=str[i+1])
        {
            rank[i]=str[i];
            c++;
        }
    }
    printf("%d",c);
    return 0;
}