#include <bits/stdc++.h>

using namespace std;
ifstream fin("iepuri.in");
ofstream fout("iepuri.out");
struct mat3x3{
    int m[4][4];
} init;
int a,b,c;
mat3x3 genm(){
    mat3x3 rez;
    for(int i = 0; i < 3; i++) for(int j = 0; j < 3; j++) rez.m[i][j] = 0;
    return rez;
}
mat3x3 prod(mat3x3 m1, mat3x3 m2){
    mat3x3 rez = genm();
    for(int i = 0; i < 3; i++) for(int j = 0; j < 3; j++){
        for(int k = 0; k < 3; k++){
            rez.m[i][j] += m1.m[i][k] * m2.m[k][j];
        }
    }
    return rez;
}
mat3x3 exp(int n){
    mat3x3 rez = genm();
    if(n == 1){
        return init;
    }
    if(n & 1){
        rez = exp(n - 1);
        return prod(rez,init);
    }
    else{
        rez = exp(n / 2);
        return prod(rez,rez);
    }
}
void print(mat3x3 x){
    for(int i = 0; i < 3; i++){
        for(int j = 0; j < 3; j++) fout << x.m[i][j] << " ";
        fout << "\n";
    }
}
void geninit(){
    init.m[0][0] = 0;
    init.m[0][1] = 0;
    init.m[0][2] = c;
    init.m[1][0] = a;
    init.m[1][1] = 0;
    init.m[1][2] = b;
    init.m[2][0] = 0;
    init.m[2][1] = 1;
    init.m[2][2] = a;
}
int main()
{
    int n,i,x,y,z,t;
    fin >> t;
    for(int e = 1; e <= t; e++){
        fin >> x >> y >> z >> a >> b >> c >> n;
        geninit();
        mat3x3 r = exp(n - 2);
        //print(r);
        fout << z * r.m[2][2] + y * r.m[1][2] + x * r.m[0][2] << "\n";
        //fout << "\n\n\n";
    }
    return 0;
}
/*
(z0,z1,z2)

(0 0 c
 1 0 b
 0 1 a)
(0 0 c
 1 0 b
 0 1 a)

(z1,z2,z3)

 z0,z1,z2
(0 c ac
 0 b c+ab
 1 a b+a2

 z2,z3,z4




*/