program cifra;
var n,t,i:integer;
    f,g:TEXT;
    s:longint;

function suma(x:integer):longint;
var j:integer;aux,sum:longint;
begin
sum:=0;
 for i:=1 to x do
  begin
  aux:=1;
   for j:=1 to i do aux:=aux*i;
  sum:=sum+aux;
  end;
  suma:=sum;
end;

begin
assign(f,'cifra.in');reset(f);
assign(g,'cifra.out');rewrite(g);
readln(f,t);
 for i:=1 to t do
  begin
   readln(f,n);
   s:=suma(n)mod 10;
   writeln(g,s);
  end;
close(f);
close(g);
end.