def ones_comp_sum16(num1: int, num2: int) ->int:
    """Calculates the 1's complement sum for 16-bit numbers.

    Args:
        num1: 16-bit number.
        num2: 16-bit number.

    Returns:
        The calculated result.
    """
    carry = 1 << 16
    result = num1 + num2
    return result if result < carry else result + 1 - carry
