#include <iostream>
#include<bits/stdc++.h>
using namespace std;
int main() {
int t;
cin>>t;
while(tโ)
{
vector v(12,0);
int p,s,n,sum=0;
cin>>n;
for(int i=0;i<n;i++)
{
cin>>p>>s;
if((p>=1&&p<=8)&&(s>v[p]))
{
v[p]=s;
}
}
cout<<accumulate(v.begin(),v.end(),sum)<<"\n";
}
return 0;
}