#include <stdio.h>

long long  N;
long long a[1000],b[1000];
long long i,s,t,u,v,ans;

long long min(long long a, long long b){
    if(a>b){return b;}else{return a;}
}

long long max(long long a, long long b){
    if(a>b){return a;}else{return b;}
}

long long ugly(long long x){
    long long mi,ma;

    mi = 1000000000000000000;
    ma = 0;
    
    for(i=0;i<N;i++){
        mi = min(mi, a[i] + b[i] * x);
        ma = max(ma, a[i] + b[i] * x);
    }

    return ma - mi;

}

int main(void){
    scanf("%I64d",&N);
    for(i=0;i<N;i++){
        scanf("%I64d %I64d",&a[i],&b[i]);
    }

    s = 1;
    t = 1000000000;
    while(t-s>2){
        u = (2*s + t)/3;
        v = (s + 2*t)/3;
        if(ugly(u)<=ugly(v)){t = v;}else{s = u;}
    }
    
    if(ugly(s)<=ugly(s+1) && ugly(s)<=ugly(s+2)){ans = s;}
    else if(ugly(s+1)<=ugly(s) && ugly(s+1)<=ugly(s+2)){ans = s+1;}
    else{ans = s+2;}
    printf("%I64d\n",ans);
}