program p12;
var f,g:text;
    j,n,uc,uc1,i,t,e:longint;
begin
assign(f,'cifra.in');reset(f);
assign(g,'cifra.out');rewrite(g);
readln(f,n);
e:=0;
for i:=1 to n do
  begin
  readln(f,t);
  e:=t;
  uc:=1;
  for j:=1  to e do
     uc:=(uc*e)mod 10;
  uc1:=(uc1+uc)mod 10;
  writeln(g,uc1);
  end;
close(g);
close(f);
end.