#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int n;
vector<ll> a,b;
ll f(ll x){
	ll ma=a[0] + b[0]*x,mi = a[0] + b[0]*x;
	for(int j=1;j<n;j++){
		ma = max(ma,a[j] + b[j]*x);
		mi = min(mi,a[j] + b[j]*x);
	}
	return -(ma - mi);
}


int main(void) {
	cin >> n;
	a.resize(n);b.resize(n);
	for(int i=0;i<n;i++){
		cin >> a[i] >> b[i];
	}

	ll left = 1,right = 1e10;
	for(int i=0;i<1000;i++){
        ll l = (2*left + right) / 3;
        ll r = (left + 2*right) / 3;
        if(f(l) < f(r)){
            left = l;
        }else{
            right = r;
        }
    }
	cout <<  (left+right)/2 << endl;;
	return 0;
}