def calculate_area(n, k, l):
  """Calculates the area of the union of squares.
 
  Args:
    n: The number of squares.
    k: The length of the side of each square.
    l: The spacing between the squares.
 
  Returns:
    The area of the union of squares.
  """
 
  total_area = 0
  for i in range(n):
    # Calculate the coordinates of the bottom-left corner of the square
    x = i * (k + l)
    y = i * (k + l)
 
    # Calculate the area of the square
    square_area = k * k
 
    # Add the area of the square to the total area
    total_area += square_area
 
  return total_area
 
# Get the input from the user
n, k, l = map(int, input().split())
 
# Calculate the area of the union of squares
area = calculate_area(n, k, l)
 
# Print the output
print(area)

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