var
x1, x2, y1, y2, r1, r2, d: real;
begin
read(x1, y1, r1, x2, y2, r2);
d := sqrt(abs(sqr(x1 - x2) + sqr(y1 - y2)));
if dr1 + r2 then
write('net')
else
write('da');
read
end.
var
x1, x2, y1, y2, r1, r2, d: real;
begin
read(x1, y1, r1, x2, y2, r2);
d := sqrt(abs(sqr(x1 - x2) + sqr(y1 - y2)));
if dr1 + r2 then
write('net')
else
write('da');
read
end.