public class LogFact {
    // Notkun: x = logFact(N)
    // Fyrir: N >= 0
    // Eftir: x = log(N!)
    public static double logFact(int N) {
	if (N == 0) {
	    return 0.0;
	}
	return Math.log(N) + logFact(N-1);
    }
}