var f,g:text;
    i,j,s,sumal,suma1:longint;
    n:longint;

begin
assign(f,'cifra.in');
reset(f);
assign(g,'cifra.out');
rewrite(g);
read(f,n);
sumal:=0;
for i:=1 to n do begin
read(f,s);
suma1:=1;
for j:=1 to s do begin
                 s:=(s mod 10);
                 suma1:=(suma1*s);
                 suma1:=(suma1 mod 10);
                 end;
sumal:=((sumal+suma1) mod 10);
writeln(g,sumal);
end;
close(f);
close(g);
end.