#include <iostream>
#include <cmath>
#include <climits>
#include <string>
#include <vector>
#include <queue>
#include <stack>
#include <functional>
#include <algorithm>
#include <sstream>
#include <map>
#include <set>
#include <utility>
#include <cstdio>

using namespace std;

#define endl '\n'
#define ALL(a)  (a).begin(),(a).end()
#define SZ(a) int((a).size())
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n)  FOR(i,0,n)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define DEBUG(x) cout<<#x<<": "<<x<<endl

typedef pair<int,int> P;
typedef long long int LL;
typedef pair<LL,LL> LP;


int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N;
	cin >> N;
	vector<int> a(N);
	vector<int> b(N);
	int maxa = -1;
	REP(i,N){
		cin >> a[i] >> b[i];
		maxa = max(maxa, a[i]);
	}
	int l = 0, r = maxa;
	while(l+1 < r){
		int m = (l+r) / 2;
		int min0 = INT_MAX, max0 = -1;
		int min1 = INT_MAX, max1 = -1;
		REP(i,N){
			min0 = min(min0, a[i] + m*b[i]);
			max0 = max(max0, a[i] + m*b[i]);
			min1 = min(min1, a[i] + (m+1)*b[i]);
			max1 = max(max1, a[i] + (m+1)*b[i]);
		}
		int f = (max1-min1) - (max0-min0);
		if(f <= 0){
			l = m;
		}else{
			r = m;
		}
	}
	cout << max(r,1) << endl;
	return 0;
}