文件目录

#include <bits/stdc++.h>
using namespace std;
int n, p, q;
int f(int a, int b)
{
    if (b == 0)
        return a;
    return f(b, a % b);
}
int main()
{
    cin >> n;
    int fz = 0, fm = 1;
    while (n--)
    {
        scanf("%d/%d", &p, &q);
        fz = fz * q + fm * p;
        fm = fm * q;
    }
    int c = f(fz, fm);
    fz /= c;
    fm /= c;
    if (fm != 1)
        cout << fz << "/" << fm;
    else
        cout << fz;
    return 0;
}