#include<bits/stdc++.h>
using namespace std;

#define int long long
#define rep(i,n) for(int i=0;i<(n);i++)
#define REP(i,a,b) for(int i=(a);i<(b);i++)
#define pb push_back
#define all(v) (v).begin(),(v).end()

int gcd(int a,int b){
    return b?gcd(b,a%b):a;
}
int lcm(int a,int b){
    return a/gcd(a,b)*b;
}

int N;
int z[50];

signed main(){
    cin>>N;
    rep(i,N)cin>>z[i];

    cout<<z[N-1]<<"/"<<z[0]<<endl;
    return 0;
}