#include<iostream>
#include<algorithm>
using namespace std;
const int BUF = 1005;
const int INF = 1 << 30;


int N;
int aList[BUF], bList[BUF];

void read() {
    cin >> N;
    for (int i = 0; i < N; ++i)
        cin >> aList[i] >> bList[i];
}


long long calc(int mul) {
    long long maxV = aList[0] + 1LL * bList[0] * mul;
    long long minV = aList[0] + 1LL * bList[0] * mul;
    
    for (int i = 1; i < N; ++i) {
        long long t = aList[i] + 1LL * bList[i] * mul;
        maxV = max(maxV, t);
        minV = min(minV, t);
    }

    return maxV - minV;
}


void work() {
    int L = 1, R = INF;
    
    while (L + 10 < R) {
        int LL = L + (R - L) / 3;
        int RR = R - (R - L) / 3;
        
        if (calc(LL) <= calc(RR))
            R = RR;
        else
            L = LL;
    }
    
    int ans = L;
    long long minV = calc(L);
    for (int i = L + 1; i <= R; ++i) {
        if (minV > calc(i)) {
            ans = i;
            minV = calc(i);
        }
    }
    
    cout << ans << endl;
}


int main() {
    read();
    work();
    return 0;
}