#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 5;
template <typename T>
bool cmax(T &a, T b) {
  return (a < b) ? a = b, 1 : 0;
}
template <typename T>
bool cmin(T &a, T b) {
  return (a > b) ? a = b, 1 : 0;
}
template <typename T>
T read() {
  T ans = 0, f = 1;
  char ch = getchar();
  while (!isdigit(ch) && ch != '-') ch = getchar();
  if (ch == '-') f = -1, ch = getchar();
  while (isdigit(ch))
    ans = (ans << 3) + (ans << 1) + (ch - '0'), ch = getchar();
  return ans * f;
}
template <typename T>
void write(T x, char y) {
  if (x == 0) {
    putchar('0'), putchar(y);
    return;
  }
  if (x < 0) {
    putchar('-');
    x = -x;
  }
  static char wr[20];
  int top = 0;
  for (; x; x /= 10) wr[++top] = x % 10 + '0';
  while (top) putchar(wr[top--]);
  putchar(y);
}
void file() {}
int n, A, B;
double x[N], y[N];
void input() {
  n = read<int>();
  A = read<int>();
  B = read<int>();
  for (register int i = (int)1; i <= (int)n; ++i) scanf("%lf%lf", &x[i], &y[i]);
}
const double eps = 1e-12;
double f(double k2) {
  double k1 = 1.0;
  for (register int i = (int)1; i <= (int)n; ++i)
    cmin(k1, (1.0 - y[i] * k2) / x[i]);
  return A * k1 + B * k2;
}
void work() {
  double l = 0, r = 1.0 / (*max_element(y + 1, y + n + 1)), ml, mr;
  while (r - l > eps) {
    ml = (l + l + r) / 3.0, mr = (l + r + r) / 3.0;
    if (f(ml) >= f(mr))
      r = mr;
    else
      l = ml;
  }
  printf("%.10lf\n", f((l + r) / 2.0));
}
int main() {
  file();
  input();
  work();
  return 0;
}
