#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream f("iepuri.in");
    ofstream g("iepuri.out");
    int t;
    f>>t;
    int n;
    int a,b,c;
    int x,y,z,p;
    for(int i=0;i<t;i++){
        f>>x>>y>>z>>a>>b>>c>>n;
        for(int j=0;j<=n-3;j++){
            p=x*c+y*b+z*a;
            x=y;
            y=z;
            z=p;
        }
        g<<p<<endl;
    }
    return 0;
}