#include <bits/stdc++.h>
using namespace std;
bool compare(long a, long b) {
  if (a > b) {
    return true;
  } else {
    return false;
  }
  return 0;
}
int main() {
  long n, a, b, x[100000], y;
  cin >> n >> a >> b;
  cin >> y;
  long long tong = y;
  for (long i = 0; i < n - 1; i++) {
    cin >> x[i];
    tong += x[i];
  }
  sort(x, x + n - 1, compare);
  long long tich = a * y / b;
  long i = 0;
  while (tong > tich) {
    tong -= x[i];
    i++;
  }
  cout << i;
  return 0;
}
