#include <iostream>
#include <cstdio>
using namespace std;

int gcd(int a, int b) {
    return b == 0 ? a : gcd(b, a%b);
}

void simplicity(int &num, int &denom) {
    int G = gcd(num, denom);
    num /= G;
    denom /= G;
}


int main() {

    char str[100];
    int n;
    int resNum = 0, resDenom = 0;
    int num, denom;
    cin >> n;
    if (n >= 1) {
        cin >> str;
        sscanf(str, "%d/%d", &resNum, &resDenom);
        simplicity(resNum, resDenom);
    }
    for (int i = 1; i < n; i++) {
        cin >> str;
        sscanf(str, "%d/%d", &num, &denom);
        simplicity(num, denom);
        int G = gcd(resDenom, denom);
        int L = resDenom*denom / G;
        resNum = resNum*(L/resDenom) + num*(L/denom);
        resDenom = L;
    }
    
    if (resNum == 0)    cout << "0" << endl;
    else {
        if (resNum % resDenom == 0) cout << resNum / resDenom << endl;
        else {
            int integ = resNum / resDenom;
            resNum = resNum % resDenom;
            simplicity(resNum, resDenom);
            if (integ != 0) cout << integ << " ";
            cout << resNum << "/" << resDenom << endl;
        }
    }
    return 0;
}