program ZuiXiaoChengCheFeiYong;
var
  w:array[1..10] of integer;
  a:array[0..100000] of longint;
  i,j,l:longint;
  min:longint;
begin
  assign(input,'busses.in');
  reset(input);
  assign(output,'busses.out');
  rewrite(output);
  for i:=1 to 10 do
    read(w[i]);
  readln(l);
  a[0]:=0;
  a[1]:=w[1];
  for i:=2 to l do
  begin
    min:=-1;
    for j:=1 to 10 do
    begin
      if i-j>=0 then
      begin
        if min=-1 then
        begin
          min:=a[i-j]+w[j]
        end
        else
        begin
          if a[i-j]+w[j]<min
            then min:=a[i-j]+w[j]
        end
      end
    end;
    a[i]:=min
  end;
  writeln(a[l]);
  close(input);
  close(output);
end.