//inlclude前用define 
#define _USE_MATH_DEFINES

//include
#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<cmath>
#include<cstdio>
#include<type_traits>
#include<numeric>
#include<limits>
#include<iomanip>
using namespace std;
//typedef
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<char> VC;

//grobal変数


int main() {
	int n;
	cin >> n;
	VI a(n);
	for (int i = 0; i < n; i++) cin >> a[i];

	sort(a.begin(), a.end());
	if (n == 1) {
		cout << 1 << endl;
	}else {
		int cnt = 0;
		bool flag = true;
		for (int i = 1; i < n; i++) {
			if (a[i - 1] != a[i]) {
				if (flag) {
					cnt++;
				}
				else {
					flag = true;
				}
			}else {
				flag = false;
			}
		}
		if (cnt == n - 1) cnt = n;
		cout << cnt << endl;
	}
	return 0;
}