def func_simple(pseudo_state, a, b, c, d):
	"""
	linear fit function for the Bellman value at given pseudo-state (for small number of data points)
	
	:param pseudo_state: list(float) - list of the four state variables for a given state
	:param a, b, c, d, e: float - parameters of the linear fit function
	"""
	sum = a*pseudo_state[0] + b*pseudo_state[1] + c*pseudo_state[2] + d*pseudo_state[3]
	return sum