#include<iostream>
#include<istream>
#include<cmath>
using namespace std;

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

int fcm(int a,int b)
{
	return a*b/gcd(a,b);
}

struct fraction
{
	int flag;
	int a,b;
};

struct fraction flex (struct fraction f,int x)
{
	struct fraction temp;
	temp.a=f.a*x/f.b;
	temp.b=x;
	temp.flag=f.flag;
	//cout << temp.a <<" " << temp.b<<endl;
	return temp;
	
}

void fplus (struct fraction* f1,struct fraction* f2)
{
	int x=fcm(f1->b,f2->b);
	*f1=flex(*f1,x);
	*f2=flex(*f2,x);
	f1->a=f1->a*f1->flag+f2->a*f2->flag;
	if (f1->a>0)
		f1->flag=1;
	else 
		f1->flag=-1;
	f1->a=abs(f1->a);
	int a=gcd(f1->a,f1->b);
	f1->a/=a;
	f1->b/=a;
}


int main()
{
	int k,temp1,temp2,n=0,flag=0;
	char c;
	struct fraction  f[100],ans;
	cin >> k ;
	while (k--)
	{
		cin >> temp1;
		cin >> c;
		cin	>> temp2;
		if (temp1<0)
			f[n].flag=-1;
		else
			f[n].flag=1;
		f[n].a=abs(temp1);
		f[n].b=temp2;
		n++;
	}
	ans=f[0];
	for (int i=1;i<n;i++)
	{
		fplus(&ans,&f[i]);
	}
	//cout << ans.flag <<" " <<ans.a <<" "<<  ans.b <<endl;
	if (ans.a==0)
	{
		cout << "0" << endl;
		return 0;
	}
	if (ans.flag<0)
	{
		cout << "-";	
	}
	int integer=ans.a/ans.b;
	ans.a-=integer*ans.b;
	if (integer!=0)
	{
		cout << integer;
		flag=1;
	}
	if (ans.a!=0)
	{
		if (flag) 
			cout <<" ";
		cout << ans.a << "/" << ans.b<<endl;
	}
}