program vali;
var f,g:text;
    j,n,nr,i,s:longint;

function ult(n:longint):integer;
var prod:integer;
begin
n:=n mod 10;
prod:=1;
 for i:=1 to n do begin
   prod:=prod*n;
   prod:=prod mod 10;
   end;
ult:=prod;
end;

begin
assign(f,'cifra.in');reset(f);
assign(g,'cifra.out');rewrite(g);
read(f,n);
s:=0;
for i:=1 to n do begin
   read(f,nr);
   s:=0;
   for j:=1 to nr do    begin
   s:=s+ult(j);
   s:=s mod 10;
   end;
   writeln(g,s);
   end;
close(f);
close(g);
end.