#include<iostream>
#include<iomanip>
#include<cmath>
#include<string>
#include<vector>
#include<algorithm>
#include<iterator>
#include<cctype>
using namespace std;
bool rn(int x) {
	return (x % 400 == 0 || ((x % 4 == 0) && (x % 100 != 0)));

}
int gcd(int x, int y) {
	if(x < 0)
		x *= -1;
	if(y < 0)
		y *= -1;
	if(x == 0)
		return 1;
	int r = x % y;
	while(r) {
		x = y;
		y = r;
		r = x % y;
	}
	return y;
}
int main() {
	int t;
	int a[105], b[105];
	cin >> t;
	int i, j;
	char c;
	for(i = 0; i < t; i++) {
		cin >> a[i] >> c >> b[i];
	}
	for(i = 1; i < t; i++) {
		int k = gcd(b[i - 1], b[i]);
		a[i] = a[i - 1] * b[i] + a[i] * b[i - 1];
		b[i] = b[i] * b[i - 1];
		k = gcd(a[i], b[i]);
		a[i] /= k;
		b[i] /= k;
	}
	int zs = 0, fs;
	if(a[t - 1] == 0)
		cout << "0";
	else if(abs(a[t - 1]) == b[t - 1]) {
		cout << a[t - 1];
	}
	else if(abs(a[t - 1]) < b[t - 1]) {
		cout << a[t - 1] << "/" << b[t - 1];
	}
	else {
		if(a[t - 1] % b[t - 1] == 0)
			cout << a[t - 1] / b[t - 1];
		else
			cout << a[t - 1] / b[t - 1] << " " << abs(a[t - 1]) - abs((a[t - 1] / b[t - 1]) * b[t - 1]) << "/" << b[t - 1];
	}
	return 0;
}