#include <iostream>
#include<fstream>
using namespace std;
int v[100],n,a,b,c,s;
ifstream f("cozonaci.in");
ofstream g("cozonaci.out");
int cmmdc(int a, int b)
{
    if(b == 0)
        return a;
    else
        return cmmdc(b, a%b);
}

int main()
{
    f>>n;
    for(int i=0; i<n; ++i){
        f>>a>>b;
        v[i]=a-b;
    }
    for(int i=0; i<n; ++i){
        c=cmmdc(c, v[i]);
        s+=v[i];
    }
    g<<s<<'\n'<<c;
    g.close();
    return 0;
}