Getting last or max "id" value from database

I try to get the max value of id from database using max() function
but a face this error.
{
TypeError at /add_db/

'builtin_function_or_method' object is not iterable

Request Method: POST
Request URL: http://localhost/django/add_db/
Django Version: 1.2.1
Exception Type: TypeError
Exception Value: 'builtin_function_or_method' object is not iterable

Exception Location: /home/jagdeep/mysite/add_db/views.py in add_db,
line 19
Python Executable: /usr/bin/python
}

model.py
from django.db import models
from django.forms import ModelForm

class Input(models.Model):
input1 = models.FloatField()
input2 = models.FloatField()

class Output(models.Model):
out = models.ForeignKey(Input)
output = models.FloatField()

class InputForm(ModelForm):
class Meta :
model = Input

class OutputForm(ModelForm):
class Meta :
model = Output

View.py
from django.http import HttpResponseRedirect
from django.shortcuts import render_to_response, get_object_or_404
from mysite.add_db.models import *
from django.template import RequestContext
from django.core.urlresolvers import reverse

def add_db(request):
if request.method == 'POST':
form = InputForm(request.POST)
if form.is_valid():
cd = form.cleaned_data
input1 = cd['input1']
input2 = cd['input2']
form.save()
form_output = OutputForm()
output = input1 + input2
p = get_object_or_404(Input, pk=max(id))
form_output_final = p.output_set.create(output=output)
return render_to_response('add_db/output.html', {'form':
form, 'input1':input1, 'input2':input2, 'output':output},
context_instance=RequestContext(request))
else:
form = InputForm()
return render_to_response('add_db/add.html', {'form': form},
context_instance=RequestContext(request))

I want to get the latest or maximum "Id" value of INPUT table from
database.

please help

Thanks

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