#include <bits/stdc++.h>
using namespace std;
int main() {
  int a;
  double b;
  cin >> a >> b;
  double x, y;
  double maxi, ans = 1000000000000.00;
  for (int i = 1; i <= a; i++) {
    cin >> x >> y;
    maxi = (x / y) * b;
    ans = min(ans, maxi);
  }
  printf("%.9lf\n", ans);
}
