Call function within a function but keep default values if not specified

I have two sub functions that feed into one main functions as defined below –

Sub function 1

def func(x=1,y=2):
    z = x + y
    return z

Sub function 2

def func2(a=3,b=4):
    c = a-b
    return c

Main function

def finalFunc(lemons, input1,input2,input3,input4):
    result = func(input1,input2) + func2(input3,input4) + lemons
    return result

How do i call my main function but if the values for the sub functions aren’t specified, they’re treated as default. Similarly if they are specified, then use them instead? e.g

>>> finalFunc(lemons = 1)
5

or

>>> finalFunc(lemons = 1, input1=4, input4=6)
6

edit – I should add, i dont want to specify the default values in my main function as the sub functions are always changing. I want to keep the default values set at whatever the sub functions contain.

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