#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  long long int t, x, sum = 0, y, z, flag = 0, a, p, l, r, b, c, q, i, j, k, n,
                      m, maxi = LONG_MIN, mini = LONG_MAX, mul = 1;
  string s, s1;
  vector<long long int> v, va, vb;
  map<long long int, long long int> mp, mp1;
  cin >> n;
  for (i = 0; i < n; i++) {
    cin >> x;
    mp[x]++;
    mp1[x]++;
  }
  auto it = mp.begin();
  auto it1 = mp1.begin();
  while (it1 != mp1.end()) {
    if (it->first == it1->first) it1++;
    if (it1 == mp1.end()) break;
    x = it->second;
    y = it1->second;
    for (i = 0; i < x && i < y; i++) {
      mp[it->first]--;
      sum++;
      mp1[it1->first]--;
    }
    if (x == i) it++;
    if (y == i) it1++;
  }
  cout << sum << endl;
}
