def mul(*args):
    
    if len(args) :
        s = 1
        for a in args:
            if  isinstance(a, (int ,float)):
                
                s*=a
        
            else:
                raise TypeError('We need int or float.')
        return s
    else :
        raise TypeError('there is no munber')

def move(n, a, b, c):
    if not isinstance (n,(int or n <= 0 and n <-1)):
        raise TypeError("'n' needs +int")
    if n == 1:
        print(a, '-->', c)
    else :
        move(n-1, a, c, b)
        move(1, a, b, c)
        move(n-1, b, a, c)

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