#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <unordered_map>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int v, w; };

ll MOD = 1000000009;
ll _MOD = 1000000009;
double EPS = 1e-10;

ll f(vector<int>& a, vector<int>& b, ll x) {
	int N = a.size();
	ll mini = INT_MAX, maxi = 0;
	for (int i = 0; i < N; i++) {
		ll c = a[i] + b[i] * x;
		mini = min(mini, c);
		maxi = max(maxi, c);
	}
	return maxi - mini;
}

int main() {
	int N; cin >> N;
	vector<int> a(N), b(N);
	for (int i = 0; i < N; i++)
		cin >> a[i] >> b[i];
	int x = 1, y = 1000000000;
	while (y - x > 2) {
		int z1 = (x * 2 + y) / 3, z2 = (x + y * 2) / 3;
		ll f1 = f(a, b, z1), f2 = f(a, b, z2);
		if (f1 > f2) x = z1;
		else y = z2;
	}
	ll_i ans(LLONG_MAX, 0);
	ans = min(ans, ll_i(f(a, b, x), x));
	ans = min(ans, ll_i(f(a, b, x + 1), x + 1));
	ans = min(ans, ll_i(f(a, b, x + 2), x + 2));
	cout << ans.second << endl;
}