import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        int b=0;
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int height[] = new int[n];
        for(int i=0; hheight.length < n,i++){
            height[i] = in.nextInt();
        }
        Arrays.sort(height);
        int a=height[0];
        for(j=0; j<=height.lenght;j++)
            {
            if(a=height[j])
                {
                b++;
            }
            
            
        }
        System.out.println(b);
    }
}