#define _USE_MATH_DEFINES
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<climits>
#include<string>
#include<vector>
#include<list>
#include<map>
#include<set>
#include<cmath>
#include<queue>
#include<cstring>
#include<stack>
using namespace std;
#define int long long

int N,A[1000],B[1000];

int latte(int c){
	int mi = LLONG_MAX, ma = LLONG_MIN;
	for(int i=0;i<N;i++){
		int size = A[i]+B[i]*c;
		mi = min(mi,size); ma = max(ma,size);
	}
	return (ma-mi)*-1;
}

signed main(){
	cin>>N;
	for(int i=0;i<N;i++) cin>>A[i]>>B[i];
	int l = 0, r = 1e9;
	while(r-l>4){
		int c1 = (l*2+r)/3, c2 = (l+r*2)/3;
		int r1 = latte(c1), r2 = latte(c2);
		if(r1>=r2) r = c2;
		else l = c1;
	}
	if(l==0) l = 1;
	int ans, ma = LLONG_MIN;
	for(int i=l;i<=r;i++){
		int ret = latte(i);
		if(ma<ret){
			ma = ret; ans = i;
		}
	}
	printf("%d\n",ans);
	return 0;
}