program lab;
const answer:array[boolean] of string = ('net','da');
var n:real;
begin
readln(n);
writeln(answer[ n div 3 = n / 3]);
end.
program lab;
const answer:array[boolean] of string = ('net','da');
var n:real;
begin
readln(n);
writeln(answer[ n div 3 = n / 3]);
end.