#include <stdio.h>
int main(void){
	int N;		//	number of words. N <= (10^5)
	int A[100000];		//	boxes(each number). A[i] <= (10^9)
	int same = 0;		//	number of same words
	int count = 0;		//	
	
	scanf("%d",&N);
	for(int i = 0;i < N;i++){
		scanf("%d",&A[i]);
	}
	
	//	printf("%d",A[0]);		//	check OK
	
	for(int j = 0;j < N;j++){
		
		for(int k = 0;k < N;k++){
			if(k == j){
				continue;
			} else if(A[j] == A[k]){
				same += 1;
			}
		}
		
		if(same == 0){
			count += 1;
		}
		same = 0;
	}
	
	printf("%d\n",count);
	
	return 0;
}