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#include <fstream>
using namespace std;
ifstream in("iepuri.in");
ofstream out("iepuri.out");
int mat[101][7], i ,j , t, v[200000000];
void f()
{
for(j=3;j<=mat[i][7];j++)
{
v[j]=mat[i][3]*mat[i][4]+mat[i][2]*mat[i][5]+mat[i][1]*mat[i][6];
mat[i][1]=mat[i][2];
mat[i][2]=mat[i][3];
mat[i][3]=v[j];
}
out<<v[mat[i][7]];
}
int main()
{
in>>t;
for(i=1;i<=t;i++)
{
for(j=1;j<=7;j++)
in>>mat[i][j];
}
for(i=1;i<=t;i++)
{
f();
out<<endl;
}
in.close();
out.close();
return 0;
}