human
Count the number of currency notes needed | Function to return the amount of notes with value A required.
If possible.
Driver code"
Solution in Python:

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Give me a code to count the number of currency notes needed and the other steps required?
assistant
#Here is code to count the number of currency notes needed and the other steps required.
 def bankNotes ( A , B , S , N ) :
	numerator = S - ( B * N )
	denominator = A - B
	if ( numerator % denominator == 0 ) :
		return ( numerator // denominator )
	return - 1
A , B , S , N = 1 , 2 , 7 , 5
print ( bankNotes ( A , B , S , N ) )