#include <bits/stdc++.h>

typedef long long ll;
typedef unsigned long long ull;

#define FOR(i,a,b) for(int (i)=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define RANGE(vec) (vec).begin(),(vec).end()

using namespace std;


class BeautifulWhitespace2 {
public:
    void solve_TLE(void) {
        int N;
        cin>>N;

        vector<ll> a(N);
        vector<ll> b(N);

        REP(i,N) cin>>a[i]>>b[i];

        auto solve = [=](int i, int j)->ll {
            if ( i == j || b[i] == b[j] )
                return -1;
            // a[i]+b[i]*x = a[j]+b[j]*x
            // x*(b[i]-b[j]) = a[j]-a[i]
            return (a[j]-a[i])/(b[i]-b[j]);
        };

        // O(N^2)
        set<int> xs;
        REP(i,N)
        FOR(j,i+1,N)
        {
            ll x = solve(i,j);
            xs.insert(x-1);
            xs.insert(x);
            xs.insert(x+1);
        }

        // O(N)
        auto f = [=](ll x) {
            ll maxF = a[0]+b[0]*x;
            ll minF = a[0]+b[0]*x;

            FOR(i,1,N)
            {
                minF = min(minF, a[i]+b[i]*x);
                maxF = max(maxF, a[i]+b[i]*x);
            }
            return maxF - minF;
        };

        ll minX = 1;
        ll minY = 1<<30;
        for (auto x : xs)
        {
            if (x <= 0)
                continue;
            ll y = f(x);
            if (y >= minY)
                continue;
            minY = y;
            minX = x;
        }
        cout<<minX<<endl;
    }
    void solve(void)
    {
        solve_TLE();
    }
};

#if 1
int main(int argc, char *argv[])
{
        ios::sync_with_stdio(false);
        auto obj = new BeautifulWhitespace2();
        obj->solve();
        delete obj;
        return 0;
}
#endif