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#include <bits/stdc++.h>
#define ft first
#define sc second
#define pb push_back
#define FOR(i,n) for(int i=0; i<n; i++)
#define FORX(i,a,b) for(int i=(a); i<=(b); i++)
#define watch(x) cerr << (#x) << " == " << (x) << endl
typedef long long ll;
typedef long double ld;
using namespace std;

int counter[500'005];
int sorted[500'005];

int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);

int n;
cin>>n;

FOR(i,n){
    int x;
    cin>>x;
    counter[x]++;
}

FORX(i,1,n){
    sorted[counter[i]]++;
}

int max_total = 0, cnt = 0;
for (int i = n; i >= 1; i--){
    while (sorted[i]){
        if (max_total >= n) {break;}
        max_total += 2*i-1;
        cnt++;
        sorted[i]--;
    }
}

cout<<cnt<<"\n";

return 0;
}