#define _USE_MATH_DEFINES
 
#include <iostream>
#include <iomanip>
#include <sstream>
 
#include <algorithm>
#include <cmath>
 
#include <string>
//#include <array>
#include <list>
#include <queue>
#include <vector>
#include <complex>
#include <set>
#include <map>
 
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
 
#define PII pair<int,int>
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////
LL f(LL x,LL* a,LL* b,int N){
	LL minV,maxV;
	minV = 0;
	maxV = 0;
	minV = a[0]+b[0]*x;
	rep(i,N){
		maxV = max(maxV, a[i]+b[i]*x);
		minV = min(minV, a[i]+b[i]*x);
	}
	return maxV-minV;
}
int main(void){
    std::cin.tie(0); 
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    //cout << setprecision(16);//
	
	int N;
	cin>>N;
	const int nmax = 1000;
	LL a[nmax],b[nmax];
	rep(i,N){
		cin>>a[i]>>b[i];
	}
	
	//
	LL Left = 1;
	LL Right;
	LL Lmid,Rmid;
	LL x = 1;
	LL start = f(x,a,b,N);
	
	LL Lval,Rval;
	do{
		x *= 2;
		Lval = f(x,a,b,N);
	}while(start > Lval);
	Left = 1;
	Right = x;
 
	do{
		Lmid = (Left*2 + Right)/3;
		Rmid = (Left + Right*2)/3;
		Lval = f(Lmid,a,b,N);
		Rval = f(Rmid,a,b,N);
		if( Rval < Lval ){
			Left = Lmid;
		}else{
			Right = Rmid;
		}
	}while( Right-Left>2 );
	Lval = f(Lmid,a,b,N);
	Rval = f(Rmid,a,b,N);
	if( Rval < Lval ){
		P(Rmid);
	}else{
		P(Lmid);
	}
	return 0;
}