#include<iostream>
#include<cstdio>
#include<vector>
#include<queue>

#include<map>
#include<set>
#include<string>
#include<algorithm>
#include<functional>
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define INF 1<<30
#define MP make_pair
#define mp make_pair
#define pb push_back
#define PB push_back
#define DEBUG(x) cout<<#x<<": "<<x<<endl
#define ll long long
#define ull unsigned long long

ll gcd(ll a,ll b){
	if(a>b) swap(b,a);
	if(b%a==0) return a;
	return gcd(b%a,a);
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;cin>>n;
	ll a[n];
	REP(i,n){
		cin>>a[i];
	}
	ll gm=a[0],gc=a[1];
	ll g=gcd(gm,gc);
	gm/=g;gc/=g;
	FOR(i,2,n){
		ll tm=gc*a[0];
		ll tc=gm;
		g= gcd(tm,a[i]);
		tc = a[i]/g * tc;
		tm = tm/g;
		gm=tm;gc=tc;
	}
	cout<<gc<<"/"<<gm<<endl;

}