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