from array import array

taux = array('d', [0., 0.055, 0.14, 0.3, 0.41, 0.45])
tranches = array('d', [0., 6011, 11991, 26631, 71397, 151200])
quotient = float(input("Quotient familial : "))

impot = 0.
i = 1
while i < len(tranches) and quotient >= 0 :
        quotient -= (tranches[i] - tranches[i-1])
        if quotient >= 0 :
            impot += quotient * (taux[i] - taux[i-1])
        i += 1
print ("Impot = " + str(impot))