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#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define mid ((l+r)/2)
#define siz(x) (int)(x).size()
#define BOOST ios_base::sync_with_stdio(0), cin.tie(0)
#define deb(x) cout << #x << ": " << x << "\n"
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;

int main(){
	BOOST;
	int n; cin >> n;
	vector<int> t(n);
	for(int i=0; i<n; i++){
		int x; cin >> x; x--;
		t[x]++;
	}
	sort(all(t), greater<int>());
	int ans = 0, sum = 0;
	for(int i=0; i<n; i++){
		if(sum < n){
			sum += t[i] + t[i]-1;
			ans++;
		}
	}
	cout << ans << "\n";
}