#include <bits/stdc++.h>
using namespace std;
const long long M = 1e9 + 7;
void solve() {
  long long n;
  cin >> n;
  map<long long, long long> m;
  for (long long i = 0; i < n; i++) {
    long long x;
    cin >> x;
    m[x]++;
  }
  long long mx = 0;
  long long ans = 0;
  for (auto it : m) {
    ans += min(mx, it.second);
    mx = max(mx, it.second);
  }
  cout << ans << "\n";
}
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  long long t = 1;
  while (t--) {
    solve();
  }
}
