#include <bits/stdc++.h>
using namespace std;
int n, m, a, b;
double ans = 99999;
int main() {
  cin >> m >> n;
  for (int i = 0; i < m; ++i) {
    cin >> a >> b;
    ans = min(ans, ((double)a / b) * n);
  }
  printf("%.10f", ans);
  return 0;
}
