/*math*/



#include <iostream>
using namespace std;

int main() {
 // your code goes here

 int count =0;
 cin>>count;
 while(count--)
 {
  int farmer =0,total=0;
  cin>>farmer;
  for(int i=0;i<farmer;i++)
  {
   int area =0,num=0,level=0;
   cin>>area>>num>>level;
   total+=area*level;
  }
  cout<<total<<endl;
 }

 return 0;
}