#include <iostream>
#include <cstdio>
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)

int num[100000001];
int main(void){
	int n; cin >> n;
	rep(i, 100000001) num[i] = 0;
	rep(i, n){
		int tmp; cin >> tmp;
		num[tmp]++;
	}
	int ans = 0;
	rep(i, 100000001){
		if(num[i] == 1)ans++;
	}
	printf("%d\n", ans);
	return 0;
}