#include <bits/stdc++.h>
using namespace std;

int main() {
   int n, t;
   cin >> n >> t;

   double d = 0.0;
   for(int i = 0; i < n; ++i) {
      double x, h;
      cin >> x >> h;
      d = max(d, h / x);
   }

   cout << fixed << setprecision(10) << d * t << endl;
}
