#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream f("iepuri.in");
    ofstream g("iepuri.out");

    int t,x,y,z,a,b,c,n,i,j,d;
    f>>t;
    for (i=1; i<=t; i++)
    {
        f>>x>>y>>z>>a>>b>>c>>n;
        for (j=1; j<=n; j++)
        {
            if (j>=3)
            {
                d=a*z+b*y+c*x;
                x=y;
                y=z;
                z=d;
            }
        }
        g<<d<<endl;
    }


    return 0;
}