import math

try: 

    while 1:

      

        n = int(input())

        box2=0

        a = ""

        b = ""

        c = 0

        

        

        for i in range(2,n-1):

            

            if n <2:

                break

            while n%i==0:

               

                n=n/i

                box1 = i

                box2 += 1

                if box2 ==1:

                    if c>=1:

                        b = " * " +str(box1)

                    else:

                        b = str(box1)

                else:

                    if c>=1:

                        b = " * "+ str(box1)+"^"+str(box2)

                    else:

                        b = str(box1)+"^"+str(box2)

            if b !="":

                c+=1

            a+=str(b)

            b = ""

            box2 = 0

        if a == "":

            print(n)

        else:

            print(a)

       

        

          

except EOFError:       

    pass

 

抱歉 剛發現把break判斷改成 if n <2 就可以了