var n:array[1..100]of longint;i,p,j,s,h,t:longint;f,g:text;
begin
assign(f,'cifra.in');reset(f);
assign(g,'cifra.out');rewrite(g);
readln(f,t);
for i:=1 to t do begin
read(f,n);
s:=0;
for j:=1 to n do begin
p:=1;
h:=0;
while h<>j do begin
p:=p*j;
p:=p mod 10;
inc(h);
end;
s:=s+p;
s:=s mod 10;
end;
writeln(g,s);
end;
close(f);
close(g);
end.