leetcode991

 class Solution:
     def brokenCalc(self, X: 'int', Y: 'int') -> 'int':
         if X>=Y :
             return Y-X
         else:
             num = 0
             while Y > X:
                 Z = Y % 2
                 if Z == 1:
                     num += 1
                     Y += 1
                 else:#Z == 0
                     K = Y // 2
                     if K >= X:
                         Y = K
                         num += 1
                     else:
                         num += 1
                         num += X-K
                         return num
         return num