UVA 10300-Ecological Premium

#include<iostream>
#include<cstdio>
#include<cmath>
typedef long long ll;
using namespace std;
int main()
{   int n,size,num,value,f;
ll sum;
cin>>n;
while(n--)
{   cin>>f;
sum=0;
for(int i=0;i<f;i++)
{

cin>>size>>num>>value;
sum+=size*value;
}
cout<<sum<<endl;
}
return 0;
}