#include <iostream>
#include <sstream>

using namespace std;

long long gcd(long long x, long long y) {
    if (x < y) swap(x, y);
    if (x % y == 0) { return y; }
    return gcd(y, x % y);
}

class Fraction {
public:
    long long numerator = 0, denominator = 1;

    void simplify() {
        if (numerator == 0) { denominator = 1; }
        long long g = gcd(numerator, denominator);
        numerator /= g, denominator /= g;
    }

    Fraction operator+(const Fraction& other) const {
        Fraction result{
            numerator * other.denominator + denominator * other.numerator,
            denominator * other.denominator
        };
        result.simplify();
        return result;
    }

    Fraction operator+=(const Fraction& other) {
        return *this = *this + other;
    }

    Fraction() = default;
    Fraction(const long long n, const long long d) : numerator(n), denominator(d) { simplify(); }

    Fraction(const string& s) {
        stringstream ss(s);
        long long n, d;
        char slash;
        if (ss >> n >> slash >> d && slash == '/') {
            numerator = n, denominator = d;
            simplify();
        } else {
            throw invalid_argument("String is not a fraction");
        }
    }

    [[nodiscard]] string to_string() const {
        if (denominator == 1) {
            return std::to_string(numerator);
        }
        return std::to_string(numerator) + '/' + std::to_string(denominator);
    }
};

int n;
string s;
Fraction ans;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n;
    for (int _ = 0; _ < n; _++) {
        // clog << ans.numerator << '/' << ans.denominator << endl;
        cin >> s;
        ans += Fraction(s);
    }

    cout << ans.to_string() << endl;

    return 0;
}