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


long long diff(vector<int> a, vector<int> b, long long x){
	long long nmin = 1e18;
	long long nmax = 0;
	for (int i = 0; i < a.size(); i++)
	{
		long long num = a[i] + b[i] * x;
		nmin = min(nmin, num);
		nmax = max(nmax, num);
	}
	return nmax - nmin;
}

int main() {
	int N;
	cin >> N;
	vector<int> a(N), b(N);
	int maxb = 0;
	int minb = (int)1e9;
	for (int i = 0; i < N; i++)
	{
		cin >> a[i] >> b[i];
		maxb = max(b[i], maxb);
		minb = min(b[i], minb);
	}

	long long low = 1;
	long long high = (long long)1e9;
	if (minb == maxb) high = 2;
	while (high - low > 3){
		long long mid1 = (low + low + high) / 3;
		long long mid2 = (low + high + high) / 3;

		long long ans1 = diff(a, b, mid1);
		long long ans2 = diff(a, b, mid2);

		if (ans1 <= ans2) high = mid2;
		else low = mid1;
	}

	long long ansnum = 1e18;
	int ans = 0;

	for (int i = low - 30; i <= low + 30; i++)
	{
		if (i <= 0) continue;
		long long r = diff(a, b, i);
		if (ansnum > r){
			ansnum = r;
			ans = i;
		}
	}
	cout << ans << endl;
}