program ni;
uses crt;
var x,i,n,j:word;
    s,c:longint;
    f,g:text;
begin
     assign(f,'cifra.in');
     reset(f);
     assign(g,'cifra.out');
     rewrite(g);
     readln(f,x);
     for i:=1 to x do
         begin
         readln(f,n);
         s:=0;
     for i:=1 to n do
         begin
              c:=1;
              for j:=1 to i do
                  c:=c*i;
              s:=s+c;
         end;
         writeln(g,s mod 10);
      end;
    close(f);
    close(g);
end.