#define _AOJ_
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef long long lint;
#define rep(i,n) for(int i=0;i<n;++i)
#define REP(i,a,b) for(int i=a;i<b;++i)

int main(){
	lint n;
	double t;cin>>n>>t;
	double ans=0,x,h;
	rep(i,n)cin>>x>>h,ans=max(ans,h*t/x);
	cout<<fixed<<setprecision(10);
	cout<<ans<<endl;
}
//sub-EOF
