#include <bits/stdc++.h>
using namespace std;
inline int read() {
  int x = 0, f = 1;
  char ch = getchar();
  while (ch < '0' || ch > '9') {
    if (ch == '-') f = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') {
    x = x * 10 + ch - '0';
    ch = getchar();
  }
  return x * f;
}
int n, a[100005], ans;
multiset<int> st;
int main() {
  n = read();
  for (int i = 1; i <= n; ++i) {
    a[i] = read();
    st.insert(a[i]);
  }
  for (int i = 1; i <= n; ++i) {
    auto it = st.upper_bound(a[i]);
    if (it == st.end())
      st.erase(st.begin());
    else {
      st.erase(it);
      ans += 1;
    }
  }
  printf("%d\n", ans);
  return 0;
}
