#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define RREP(i,s,e) for (i = s; i >= e; i--)
#define rrep(i,n) RREP(i,n,0)
#define REP(i,s,e) for (i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)
#define INF 1e8

typedef long long ll;

int n;
ll a[1000], b[1000], c[1000];

ll f(ll x) {
    int i;
    rep (i,n) c[i] = a[i] + b[i] * x;
    return *max_element(c,c+n) - *min_element(c,c+n);
}

int main() {
    int i;
    ll r, l;
    cin >> n;
    rep (i,n) cin >> a[i] >> b[i];
    l = 1;
    r = 1e9;
    while (l < r) {
        ll m1 = (l*2+r) / 3;
        ll m2 = (l+r*2+1) / 3;
        if (f(m1) <= f(m2))
            r = m2-1;
        else
            l = m1+1;
    }
    cout << r << endl;
    return 0;
}