human
Count of ways to write N as a sum of three numbers | Function to find the number of ways.
Check if number is less than 2.
Calculate the sum.
Driver code"
How can the above be solved in Python?
assistant
#Here is code to count of ways to write N as a sum of three numbers and the other steps required.
 def countWays ( N ) :
	if ( N <= 2 ) :
		print ( " - 1" )
	else :
		ans = ( N - 1 ) * ( N - 2 ) / 2
	print ( ans )
if __name__ == ' _ _ main _ _ ' :
	N = 5
	countWays ( N )