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#include<bits/stdc++.h>
using namespace std;
int a[5000000];
int main() {
	ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, x;
    cin >> n;
    for(int i = 0; i < n; i++) {
    	cin >> x;
    	a[x - 1]++;
	}
	sort(a, a + n, greater <int>());
	x = 0;
	while(a[x] > 0) {
		n -= (a[x] * 2) - 1;
		x++;
		if(n <= 0) {
			break;
		}
	}
	cout << x;
    return 0;
}