#include <algorithm>
#include <iostream>
#include <cstdio>
#include <map>
#include <numeric>
#include <cmath>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <queue>
#include <stack>
#include <complex>
#include <string.h>
#include <unordered_set>
#include <unordered_map>
#include <bitset>
#include <iomanip>
#include <sys/time.h>
#include <tuple>
#include <random>
using namespace std;

#define endl '\n'
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define UNIQ(v) (v).erase(unique((v).begin(), (v).end()), (v).end())

typedef long long ll;
typedef long double ld;
typedef pair<int, int> P;
typedef complex<double> comp;
typedef vector< vector<ld> > matrix;
struct pairhash {
public:
    template<typename T, typename U>
    size_t operator()(const pair<T, U> &x) const {
	size_t seed = hash<T>()(x.first);
	return hash<U>()(x.second) + 0x9e3779b9 + (seed<<6) + (seed>>2);
    }
};
const int inf = 1e9 + 9;
const ll mod = 1e9 + 7;
const double eps = 1e-8;
const double pi = acos(-1);

int N, n;
ll A[1010], B[1010];
ll a[1000100], b[1000100];

ll check(ll k) {
    ll lb = 1, ub = 1e10;
    for (int i = 0; i < n; i++) {
        if (b[i] == 0) {
            if (a[i] > k) return -1;
        } else if (b[i] > 0) {
            ub = min(ub, (k - a[i]) / b[i]);
        } else {
            lb = max(lb, (a[i] - k - b[i] - 1) / -b[i]);
        }
    }
    return (ub >= lb ? lb : -1);
}

ll solve() {
    n = N * N;
    int idx = 0;
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < N; j++) {
            a[idx] = A[i] - A[j];
            b[idx] = B[i] - B[j];
            idx++;
        }
    }

    ll lb = -1, ub = 1e12;
    ll res;
    while (ub - lb > 1) {
        ll mid = (ub + lb) / 2;
        ll c = check(mid);
        if (c >= 0) {
            res = c;
            ub = mid;
        } else {
            lb = mid;
        }
    }
    return res;
}

void input() {
    cin >> N;
    for (int i = 0; i < N; i++) cin >> A[i] >> B[i];
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(15);

    input();
    cout << solve() << endl;
}