program xmz;
var
 i,b,n,a:longint;
 f1,f2:text;
 z:array[1..10]of integer;
 f:array[0..1000]of longint;
begin
 assign(f1,'busses.in');assign(f2,'busses.out');
 reset(f1);rewrite(f2);
 for i:=1 to 10 do
  read(f1,z[i]);
 for i:=1 to 1000 do f[i]:=200000;
 read(f1,n);
 for a:=1 to n do
  if a>10 then
  begin
   for b:=a-10 to a-1 do
    if f[b]+z[a-b]<f[a] then
     f[a]:=f[b]+z[a-b];
  end
  else
    for b:=0 to a-1 do
    if f[b]+z[a-b]<f[a] then
     f[a]:=f[b]+z[a-b];


  writeln(f2,f[n]);
 close(f1);close(f2);
end.