#include<bits/stdc++.h>
using namespace std;
#define int long long

#ifdef LOCAL_DEBUG
  #include "LOCAL_DEBUG.hpp"
#endif

signed main(){

  int n; cin >> n;
  vector<int> a(n),b(n);
  for(int i = 0; i < n; i++){
    cin >> a[i] >> b[i];
  }

  auto f = [&](int x){
    int mx = -1,mn = 1LL << 60;
    for(int i = 0; i < n; i++){
      mx = max(mx,a[i]+b[i]*x);
      mn = min(mn,a[i]+b[i]*x);
    }
    return mx - mn;
  };

  int left = 1,right = 1 << 30;
  //[left , t1 , t2 , right]
  for(int i = 0; i < 100; i++){
    int t1 = (left * 2 + right) / 3;
    int t2 = (left + right * 2) / 3;

    if(f(t1) > f(t2)) left = t1;
    else right = t2;
  }

  int res = 1 << 30,ans = right;
  for(int i = left; i <= right; i++){
    if(res > f(i)){
      res = f(i);
      ans = i;
    }
  }
  cout << ans << endl;

  return 0;
}