var i,j,r,c,x,t:longint;
    f,g:text;
    n:longint;
function cif(n:longint):integer;
var c:integer;
begin
c:=n mod 10;
for i:=1 to n-1 do
    begin
    c:=c*n;
    c:=c mod 10;
    end;
cif:=c;
end;
begin
assign(f,'cifra.in');reset(f);
assign(g,'cifra.out');rewrite(g);
readln(f,t);
for r:=1 to t do
    begin
    readln(f,n);  x:=0;
    for j:=1 to n do
        begin
        x:=x+cif(j);
        x:=x mod 10;
        end;
    writeln(g,x);
    end;
close(f);close(G);
end.