from math import factorial
def mmc(lam,mu,c):
        if lam < mu :
                if c>=1:
                        RO=(1.0)*lam/mu

P0=1/((sum(RO**(c-1))/factorial(c-1))+((RO**c)/factorial(c))*(1/(1-RO/c))
                        a=RO**c
                        b=factorial(c)
                        d=a/b
                        e=d*P0
                        g=RO/c
                        h=(1-RO/c)**2
                        f=e*(g/h)
                        #Lq=(((RO**c)/factorial(c))*P0)*((RO/c)/((1-RO/c)**2))#
                        L=Lq+RO#
                        Wq=Lq/lam
                        Ws=1/mu
                        W=Wq+Ws
        else:
                print 'lam > or = to mu, so system do not exist, please try
                again !'