input: Write a Python function to calculate the sum of unique numbers in a specified list.
  assert find_UniqueSum([1,2,3,1,1,4,5,6],8) == 21
  assert find_UniqueSum([1,10,9,4,2,10,10,45,4],9) == 71
  assert find_UniqueSum([12,10,9,45,2,10,10,45,10],9) == 78
output: def find_UniqueSum(lst, n):
      return sum(set(lst))