#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
using vi = vector<i64>;
using vvi = vector<vi>;

int main() {
    int n;
    cin >> n;
    vi as(n), bs(n);
    for (int i = 0; i < n; i++) {
        cin >> as[i] >> bs[i];
    }

    i64 l = 1, r = 1000000001;

    auto kek = [&](i64 m) {
        i64 nax = 0, nin = 2e18;
        for (int i = 0; i < n; i++) {
            nin = min(nin, as[i] + bs[i] * m);
            nax = max(nax, as[i] + bs[i] * m);

        }
        return nax - nin;
    };

    while (l < r - 3) {
        i64 ml = l + (r - l) / 3, mr = l + (r - l) / 3 * 2;
        if (kek(ml) <= kek(mr)) {
            r = mr;
        } else {
            l = ml;
        }
    }

    i64 mi = 2e18;
    for (i64 k = l; k < r; k++) {
        mi = min(mi, kek(k));
    }
    for (i64 k = l; k < r; k++) {
        if (kek(k) == mi) {
            cout << k << endl;
            return 0;
        }
    }
}