double calculatempoinem(double duracaominima, double duracaomedia){
	double u=0,dur=0;
	u = ((double)rand()+1.0) / ((double)RAND_MAX+1.0);

	dur=duracaominima+(-duracaomedia * (log(u)));
	if(dur>4) dur=4;
	return dur;
}

double calculatempoprote(double duracaominima, double duracaomedia){
	double u=0,dur=0;
	u = ((double)rand()+1.0) / ((double)RAND_MAX+1.0);

	dur=duracaominima+(-duracaomedia * (log(u)));
	return dur;

}