#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int n;
  cin >> n;
  long long int a[n + 1];
  for (long long int i = 0; i < n; i++) cin >> a[i];
  sort(a, a + n);
  long long int j = 0;
  for (long long int i = 0; i < n; i++)
    if (a[i] > a[j]) j++;
  cout << j << endl;
}
