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

using ll = long long;

template<typename T>
using vec = vector<T>;
template<typename T>
using mat = vector<vec<T>>;

using pi = pair<int,int>;

#define rep(a,b) for(int a=0; a<b; ++a)
#define Rep(a,b,c) for(int a=b; a<c; ++a)

int main(){
	int N,t; cin>>N>>t;
	vec<pi> v(N);
	double tangent=0.0000000;
	rep(i,N){
		cin>>v[i].first>>v[i].second;
		tangent=max(tangent,(double)v[i].second/(double)v[i].first);
	}
	cout<<fixed<<setprecision(10)<<tangent*t<<endl;
}

