/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	
	static boolean hb[];
	
	public static void main (String[] args) throws java.lang.Exception
	{
	    Scanner sc = new Scanner(System.in);

	    // N(配列数)
	    int n = sc.nextInt();
	    //System.out.println("n=" + n);
	    
	    hb= new boolean[n]; 
	    

	    // 配列
	    int hs[];
	    hs= new int[n]; 

        int index = 0;
	    while((sc.hasNext()) && (index < n + 1)){
	        int s = sc.nextInt();
	        hs[index] = s;
	        //System.out.println("hs[index]=" + hs[index]);
		    index++;
	    }

		// 新規カウント
		int c = 0;
	    for (int i = 0; i < n; i++){
		  	if (isSinki(hs, n, i) ) {
		  		c++;
		  	}
		}
		
		System.out.println(c);
	}
	
	
	public static boolean isSinki (int[] hs, int n, int index) {
		
		if (hb[index]) {
			return false;
		}
		
		
		for (int i = index + 1; i < n; i++){
			
				if (hs[i] == hs[index]) {
					hb[i] = true;
					return false;
				}

		}
		
		return true;		
	}
	
		
}