#include<iostream>
#include<climits>
using namespace std;
int main()
{
    int maxim,minim,d,x,n,i,r=0,aux1,aux2,M=0,a,b;
    cin>>n;
    maxim=INT_MIN;
    minim=INT_MAX;
    for(i=1;i<=n;i++)
    {
        cin>>x;
        if(x>maxim)
        {
            maxim=x;
        }
        if(x<minim)
        {
            minim=x;
        }
        aux1=maxim;
        aux2=minim;
        while(aux2!=0)
        {
            r=aux1%aux2;
            aux1=aux2;
            aux2=r;
        }

    }
    a=maxim/aux1;
    b=minim/aux1;
    cout<<b<<"/"<<a;
    return 0;

}