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

#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include<boost/multiprecision/cpp_dec_float.hpp>
using ld=boost::multiprecision::cpp_dec_float_50;

int main(){
	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	int N;cin>>N;
	
	ld pmx=0,qmx=0;
	for(int i=0;i<N;i++){
		ld x,y;cin>>x>>y;
		pmx=max(pmx,x*x+y*y);
	}
	for(int i=0;i<N;i++){
		ld x,y;cin>>x>>y;
		qmx=max(qmx,x*x+y*y);
	}

	cout<<fixed<<setprecision(50);
	ld ans=pmx/qmx;
	ans=sqrt(ans);
	cout<<ans<<endl;
}