input: Write a function to calculate the sum of squares of all the numbers from 1 to N.
  
  def sum_of_squares(n):
      result = 0
      for i in range(1, n+1):
          result += i**2
      return result
  
  assert sum_of_squares(10)==385
  assert sum_of_squares(5)==55
  assert sum_of_squares(0)==0
  assert sum_of_squares(1)==1
  assert sum_of_squares(3)==14
output: def sum_of_squares(n):
      result = 0
      for i in range(1, n+1):
          result += i**2
      return result