program cifra;
var f,g:text;
    n:int64;
    t,i,j,y,p,s:longint;
begin
assign(f,'cifra.in');
assign(g,'cifra.out');
reset(f);
rewrite(g);
read(f,t);
for y:=1 to t do
  begin
    read(f,n);
    s:=0;
    for i:=1 to n do
      begin
        p:=1;
        for j:=1 to i do
          begin
            p:=p*i;
            if (p>10)then p:=p mod 10;
        end;
        s:=s+p;
        s:=s mod 10;
      end;
    writeln(g,s mod 10);
  end;
close(f);
close(g);
end.