#include "bits/stdc++.h"
#define rep(i,a,n) for(int i = a;i < n;i++)
typedef unsigned long long ull;
typedef long long ll;
using namespace std;

int main(){
    double memo = 0,a,b;
    int n,t;
    cin >> n >> t;
    
    rep(i,0,n){
        cin >> a >> b;
        if(memo < (double)b / (double)a){
            memo = (double)b/(double)a;
        }
    }
    
    cout << setprecision(10) << t*memo << endl;
    
    return 0;
}
