#include <bits/stdc++.h>
using namespace std;
double a[100000];
double b[100000];
double calculate(int n, double x, int p, int q) {
  double y = 1;
  for (auto i = 0; i < n; i++)
    y = y < (1 - x * b[i]) / (a[i]) ? y : (1 - x * b[i]) / (a[i]);
  auto res = y * p + x * q;
  return res;
}
int main() {
  ios::sync_with_stdio(false);
  int n, p, q;
  double bmax = 0, len = 0;
  cin >> n >> p >> q;
  for (auto i = 0; i < n; i++) {
    cin >> a[i] >> b[i];
    if (b[i] > bmax) bmax = b[i];
  }
  auto r = 1 / bmax;
  for (auto i = 0; i < 50; i++) {
    auto c = (len + r) * 0.5;
    auto d = (c + r) * 0.5;
    if (calculate(n, c, p, q) > calculate(n, d, p, q))
      r = d;
    else
      len = c;
  }
  cout << setprecision(10) << calculate(n, (len + r) * 0.5, p, q) << endl;
  return 0;
}
