public double fitness(){
		double sum = 0;
		double F,f,c,k;
		
		k=2;
		
		for(int i = 0; i < bins.size(); i++){
			f = bins.get(i).getFilled();
			c = bins.get(i).getCapacity();
			sum = sum + Math.pow(f/c, k);
		}
		
		F = sum / bins.size();
		
		return F;
	}