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#include <iostream>
#include <fstream>
using namespace std;
int main() {
ifstream f("iepuri.in");
ofstream g("iepuri.out");
int t,i,j,m;
long long n,v[3][4],x;
f>>t;
for(m=1;m<=t;m++) {
for(i=1;i<=2;i++) {
for(j=1;j<=3;j++) {
if(i==2)
f>>v[i][3-j+1];
else
f>>v[i][j];
}
}
f>>n;
while(n!=2) {
x=v[1][1]*v[2][1]+v[1][2]*v[2][2]+v[1][3]*v[2][3];
v[1][1]=v[1][2];
v[1][2]=v[1][3];
v[1][3]=x;
n--;
}
g<<x<<endl;
}
return 0;
}