comefrom: <doocs>0793.Preimage Size of Factorial Zeroes Function_1.py
code: def f(x):
      if x == 0:
          return 0
      return x // 5 + f(x // 5)
masked: def sample_funcname ( var_1 ) :
      if var_1 == 0 :
          return 0
      return var_1 // 5 + var_0 ( var_1 // 5 )
  