def recherche_dichotomique(element, liste_triee ):

	i = a = 0
	b = len(liste_triee)
	fini = (a > b)
	print element
	while not fini :
		m = (a+b)/2
		if liste_triee[m] == element :
			fini = True
			i =i+1
		elif liste_triee[m] > element :
			b = m-1
			i = i+2
		else :
			a = m+1
			i = i+2
		fini = fini or (a>b)
	return i