#include <bits/stdc++.h>
using namespace std;
const int N = 300005;
pair<int, int> p[N];
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) cin >> a[i];
  sort(a, a + n);
  int i = 0, j = 0;
  while (j < n) {
    if (a[i] < a[j]) i++;
    j++;
  }
  cout << i << endl;
  return 0;
}
