include

include

include

include

include

include

using namespace std;

void Luxury_Hampers(int n, vector a, vector b){ long sum1=0,sum2=0; int sum_of_a_till_now=0; int sum_of_b_till_now=0;

int till_now_bad_a=0;
int till_now_bad_b=0;

int flag=0;
vector <int> Na;
vector <int> Nb;
for (int i=0; i<n; i++){
    float r1,r2;
    flag=0;
    sum_of_a_till_now+=a[i];
    sum_of_b_till_now+=b[i];
    for (int j=a[i]-1; j>0; j--){
        r1=(float)j/a[i];
        for (int k=1; k<=b[i]; k++){
            r2=(float)k/b[i];
            if (r2>r1){
                till_now_bad_a+=j;
                till_now_bad_b+=k;
                if (i>0){
                    float prev_a = (float)till_now_bad_a/sum_of_a_till_now;
                    float prev_b = (float)till_now_bad_b/sum_of_b_till_now;
                    if (prev_a>prev_b){
                        Na.push_back(j);
                        Nb.push_back(k);
                        flag=1;
                        break;
                    }
                    else{
                        till_now_bad_a-=j;
                        till_now_bad_b-=k;
                    }
                }
                else{
                    Na.push_back(j);
                    Nb.push_back(k);
                    flag=1;
                    break;
                }
            }
        }
        if (flag==1)
        break;
    }
}
for (int i=0; i<n; i++){
    sum1+=a[i];
    sum2+=b[i];
}
long suma=0,sumb=0;
for (int i=0; i<Na.size(); i++){
    suma+=Na[i];
    sumb+=Nb[i];
}

long num=suma*sum2;
long den=sumb*sum1;

if (num>den){
    int a=num%den;
    if (num%a==0&&den%a==0){
        num/=a;
        den/=a;
    }
    cout<<num<<"/"<<den;
}
else if (den>num){
    int a=den%num;
    if (den%a==0&&num%a==0){
        num/=a;
        den/=a;
    }
    cout<<num<<"/"<<den;
}  

}

int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */ int n; cin>>n; vector a; vector b; for (int i=0; i>x; a.push_back(x); } for (int i=0; i>x; b.push_back(x); }

Luxury_Hampers(n,a,b);
return 0;

}