#include <bits/stdc++.h>
int data[100010];
int main() {
  int n, a, b, out;
  scanf("%d%d%d%d", &n, &a, &b, &out);
  long long sum = out;
  for (int i = 1; i < n; i++) {
    scanf("%d", data + i);
    sum += data[i];
  }
  std::sort(data + 1, data + n);
  int cnt = n;
  while (double(a) * out / double(sum) < b) {
    sum -= data[--cnt];
  }
  printf("%d\n", n - cnt);
  return 0;
}
