program cifra;
var a,k,b:longint;
    f,g:text;

function gasire(b:longint):byte;
var aux,i:longint;
begin
aux:=b;
for i:=1 to b-1 do begin
    b:=b*aux;
    b:=b mod 10;
end;{for}
gasire:=b;
end;

function ultima(b:longint):byte;
var j,s:longint;
begin
s:=0;
for j:=1 to b do
    s:=s+gasire(j);
s:=s mod 10;
ultima:=s;
end;

begin
     assign(f,'cifra.in');reset(f);
     assign(g,'cifra.out');rewrite(g);
     readln(f,a);
     for k:=1 to a do begin
         readln(f,b);
         writeln(g,ultima(b));
     end;
     close(f);close(g);
end.