#include<iostream>
#include<cstdio>
using namespace std;
int a[100];
int b[100];
int main()
{
int i,n,sum=1,s=0;
char ch;
scanf("%d",&n);
for(i=1;i<=n;i++)
{
scanf("%d%c%d",&a[i],&ch,&b[i]);
sum=sum*b[i];
}
for(i=1;i<=n;i++)
a[i]=a[i]*(sum/b[i]);
for(i=1;i<=n;i++)
s=s+a[i];
i=2;
while(i<=s||i<=sum)
{
if(s%i==0&&sum%i==0)
{
sum=sum/i;
s=s/i;
}
else i++;
}
if(sum!=1)
cout<<s<<"/"<<sum;
else cout<<s;
return 0;
}
1209
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