#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(false);
  int n, val;
  cin >> n;
  vector<int> vet;
  for (int i = 0; i < n; i++) {
    cin >> val;
    vet.push_back(val);
  }
  sort(vet.begin(), vet.end());
  vector<int> ans;
  while (ans.size() < n) {
    set<int> opa;
    for (int i = 0; i < n; i++) {
      if (vet[i] != -1) opa.insert(vet[i]);
    }
    set<int>::iterator it = opa.begin();
    while (it != opa.end()) {
      ans.push_back(*it);
      it++;
    }
    for (int i = 0; i < n; i++) {
      if (opa.count(vet[i])) {
        opa.erase(vet[i]);
        vet[i] = -1;
      }
    }
  }
  int resp = 0;
  for (int i = 0; i < n - 1; i++) {
    if (ans[i + 1] > ans[i]) resp++;
  }
  cout << resp << '\n';
  return 0;
}
