#include <iostream>

using namespace std;

int main()
{
    int tests, farmers, sqm, animal, ef, sum;

    cin >> tests;
    for(int t = 0; t < tests; t++)
    {
        sum = 0;
        cin >> farmers;

        for(int f = 0; f < farmers; f++)
        {
            cin >> sqm >> animal >> ef;
            sum += sqm*ef;
        }
        cout << sum << endl;
    }

    return 0;
}