program gigel;
var n,x,i,s,p,j,k:longint;
        f,g:text;
begin
assign(f,'cifra.in');
assign(g,'cifra.out');
reset(f);
rewrite(g);
read(f,n);
for i:=1 to n do
begin
        read(f,x);
        s:=0;
        for j:=1 to x do
        begin
        p:=1;
        for k:=1 to j do p:=p*j;
        s:=s+p;
        end;
        writeln(g,s mod 10);
end;
close(f);
close(g);
end.